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Copyright 2022 Justin Ridgewell <jridgewell@google.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# @jridgewell/gen-mapping
> Generate source maps
`gen-mapping` allows you to generate a source map during transpilation or minification.
With a source map, you're able to trace the original location in the source file, either in Chrome's
DevTools or using a library like [`@jridgewell/trace-mapping`][trace-mapping].
You may already be familiar with the [`source-map`][source-map] package's `SourceMapGenerator`. This
provides the same `addMapping` and `setSourceContent` API.
## Installation
```sh
npm install @jridgewell/gen-mapping
```
## Usage
```typescript
import { GenMapping, addMapping, setSourceContent, toEncodedMap, toDecodedMap } from '@jridgewell/gen-mapping';
const map = new GenMapping({
file: 'output.js',
sourceRoot: 'https://example.com/',
});
setSourceContent(map, 'input.js', `function foo() {}`);
addMapping(map, {
// Lines start at line 1, columns at column 0.
generated: { line: 1, column: 0 },
source: 'input.js',
original: { line: 1, column: 0 },
});
addMapping(map, {
generated: { line: 1, column: 9 },
source: 'input.js',
original: { line: 1, column: 9 },
name: 'foo',
});
assert.deepEqual(toDecodedMap(map), {
version: 3,
file: 'output.js',
names: ['foo'],
sourceRoot: 'https://example.com/',
sources: ['input.js'],
sourcesContent: ['function foo() {}'],
mappings: [
[ [0, 0, 0, 0], [9, 0, 0, 9, 0] ]
],
});
assert.deepEqual(toEncodedMap(map), {
version: 3,
file: 'output.js',
names: ['foo'],
sourceRoot: 'https://example.com/',
sources: ['input.js'],
sourcesContent: ['function foo() {}'],
mappings: 'AAAA,SAASA',
});
```
### Smaller Sourcemaps
Not everything needs to be added to a sourcemap, and needless markings can cause signficantly
larger file sizes. `gen-mapping` exposes `maybeAddSegment`/`maybeAddMapping` APIs that will
intelligently determine if this marking adds useful information. If not, the marking will be
skipped.
```typescript
import { maybeAddMapping } from '@jridgewell/gen-mapping';
const map = new GenMapping();
// Adding a sourceless marking at the beginning of a line isn't useful.
maybeAddMapping(map, {
generated: { line: 1, column: 0 },
});
// Adding a new source marking is useful.
maybeAddMapping(map, {
generated: { line: 1, column: 0 },
source: 'input.js',
original: { line: 1, column: 0 },
});
// But adding another marking pointing to the exact same original location isn't, even if the
// generated column changed.
maybeAddMapping(map, {
generated: { line: 1, column: 9 },
source: 'input.js',
original: { line: 1, column: 0 },
});
assert.deepEqual(toEncodedMap(map), {
version: 3,
names: [],
sources: ['input.js'],
sourcesContent: [null],
mappings: 'AAAA',
});
```
## Benchmarks
```
node v18.0.0
amp.js.map
Memory Usage:
gen-mapping: addSegment 5852872 bytes
gen-mapping: addMapping 7716042 bytes
source-map-js 6143250 bytes
source-map-0.6.1 6124102 bytes
source-map-0.8.0 6121173 bytes
Smallest memory usage is gen-mapping: addSegment
Adding speed:
gen-mapping: addSegment x 441 ops/sec ±2.07% (90 runs sampled)
gen-mapping: addMapping x 350 ops/sec ±2.40% (86 runs sampled)
source-map-js: addMapping x 169 ops/sec ±2.42% (80 runs sampled)
source-map-0.6.1: addMapping x 167 ops/sec ±2.56% (80 runs sampled)
source-map-0.8.0: addMapping x 168 ops/sec ±2.52% (80 runs sampled)
Fastest is gen-mapping: addSegment
Generate speed:
gen-mapping: decoded output x 150,824,370 ops/sec ±0.07% (102 runs sampled)
gen-mapping: encoded output x 663 ops/sec ±0.22% (98 runs sampled)
source-map-js: encoded output x 197 ops/sec ±0.45% (84 runs sampled)
source-map-0.6.1: encoded output x 198 ops/sec ±0.33% (85 runs sampled)
source-map-0.8.0: encoded output x 197 ops/sec ±0.06% (93 runs sampled)
Fastest is gen-mapping: decoded output
***
babel.min.js.map
Memory Usage:
gen-mapping: addSegment 37578063 bytes
gen-mapping: addMapping 37212897 bytes
source-map-js 47638527 bytes
source-map-0.6.1 47690503 bytes
source-map-0.8.0 47470188 bytes
Smallest memory usage is gen-mapping: addMapping
Adding speed:
gen-mapping: addSegment x 31.05 ops/sec ±8.31% (43 runs sampled)
gen-mapping: addMapping x 29.83 ops/sec ±7.36% (51 runs sampled)
source-map-js: addMapping x 20.73 ops/sec ±6.22% (38 runs sampled)
source-map-0.6.1: addMapping x 20.03 ops/sec ±10.51% (38 runs sampled)
source-map-0.8.0: addMapping x 19.30 ops/sec ±8.27% (37 runs sampled)
Fastest is gen-mapping: addSegment
Generate speed:
gen-mapping: decoded output x 381,379,234 ops/sec ±0.29% (96 runs sampled)
gen-mapping: encoded output x 95.15 ops/sec ±2.98% (72 runs sampled)
source-map-js: encoded output x 15.20 ops/sec ±7.41% (33 runs sampled)
source-map-0.6.1: encoded output x 16.36 ops/sec ±10.46% (31 runs sampled)
source-map-0.8.0: encoded output x 16.06 ops/sec ±6.45% (31 runs sampled)
Fastest is gen-mapping: decoded output
***
preact.js.map
Memory Usage:
gen-mapping: addSegment 416247 bytes
gen-mapping: addMapping 419824 bytes
source-map-js 1024619 bytes
source-map-0.6.1 1146004 bytes
source-map-0.8.0 1113250 bytes
Smallest memory usage is gen-mapping: addSegment
Adding speed:
gen-mapping: addSegment x 13,755 ops/sec ±0.15% (98 runs sampled)
gen-mapping: addMapping x 13,013 ops/sec ±0.11% (101 runs sampled)
source-map-js: addMapping x 4,564 ops/sec ±0.21% (98 runs sampled)
source-map-0.6.1: addMapping x 4,562 ops/sec ±0.11% (99 runs sampled)
source-map-0.8.0: addMapping x 4,593 ops/sec ±0.11% (100 runs sampled)
Fastest is gen-mapping: addSegment
Generate speed:
gen-mapping: decoded output x 379,864,020 ops/sec ±0.23% (93 runs sampled)
gen-mapping: encoded output x 14,368 ops/sec ±4.07% (82 runs sampled)
source-map-js: encoded output x 5,261 ops/sec ±0.21% (99 runs sampled)
source-map-0.6.1: encoded output x 5,124 ops/sec ±0.58% (99 runs sampled)
source-map-0.8.0: encoded output x 5,434 ops/sec ±0.33% (96 runs sampled)
Fastest is gen-mapping: decoded output
***
react.js.map
Memory Usage:
gen-mapping: addSegment 975096 bytes
gen-mapping: addMapping 1102981 bytes
source-map-js 2918836 bytes
source-map-0.6.1 2885435 bytes
source-map-0.8.0 2874336 bytes
Smallest memory usage is gen-mapping: addSegment
Adding speed:
gen-mapping: addSegment x 4,772 ops/sec ±0.15% (100 runs sampled)
gen-mapping: addMapping x 4,456 ops/sec ±0.13% (97 runs sampled)
source-map-js: addMapping x 1,618 ops/sec ±0.24% (97 runs sampled)
source-map-0.6.1: addMapping x 1,622 ops/sec ±0.12% (99 runs sampled)
source-map-0.8.0: addMapping x 1,631 ops/sec ±0.12% (100 runs sampled)
Fastest is gen-mapping: addSegment
Generate speed:
gen-mapping: decoded output x 379,107,695 ops/sec ±0.07% (99 runs sampled)
gen-mapping: encoded output x 5,421 ops/sec ±1.60% (89 runs sampled)
source-map-js: encoded output x 2,113 ops/sec ±1.81% (98 runs sampled)
source-map-0.6.1: encoded output x 2,126 ops/sec ±0.10% (100 runs sampled)
source-map-0.8.0: encoded output x 2,176 ops/sec ±0.39% (98 runs sampled)
Fastest is gen-mapping: decoded output
```
[source-map]: https://www.npmjs.com/package/source-map
[trace-mapping]: https://github.com/jridgewell/trace-mapping

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import { SetArray, put } from '@jridgewell/set-array';
import { encode } from '@jridgewell/sourcemap-codec';
import { TraceMap, decodedMappings } from '@jridgewell/trace-mapping';
const COLUMN = 0;
const SOURCES_INDEX = 1;
const SOURCE_LINE = 2;
const SOURCE_COLUMN = 3;
const NAMES_INDEX = 4;
const NO_NAME = -1;
/**
* A low-level API to associate a generated position with an original source position. Line and
* column here are 0-based, unlike `addMapping`.
*/
let addSegment;
/**
* A high-level API to associate a generated position with an original source position. Line is
* 1-based, but column is 0-based, due to legacy behavior in `source-map` library.
*/
let addMapping;
/**
* Same as `addSegment`, but will only add the segment if it generates useful information in the
* resulting map. This only works correctly if segments are added **in order**, meaning you should
* not add a segment with a lower generated line/column than one that came before.
*/
let maybeAddSegment;
/**
* Same as `addMapping`, but will only add the mapping if it generates useful information in the
* resulting map. This only works correctly if mappings are added **in order**, meaning you should
* not add a mapping with a lower generated line/column than one that came before.
*/
let maybeAddMapping;
/**
* Adds/removes the content of the source file to the source map.
*/
let setSourceContent;
/**
* Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
let toDecodedMap;
/**
* Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
let toEncodedMap;
/**
* Constructs a new GenMapping, using the already present mappings of the input.
*/
let fromMap;
/**
* Returns an array of high-level mapping objects for every recorded segment, which could then be
* passed to the `source-map` library.
*/
let allMappings;
// This split declaration is only so that terser can elminiate the static initialization block.
let addSegmentInternal;
/**
* Provides the state to generate a sourcemap.
*/
class GenMapping {
constructor({ file, sourceRoot } = {}) {
this._names = new SetArray();
this._sources = new SetArray();
this._sourcesContent = [];
this._mappings = [];
this.file = file;
this.sourceRoot = sourceRoot;
}
}
(() => {
addSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
return addSegmentInternal(false, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
};
maybeAddSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
return addSegmentInternal(true, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
};
addMapping = (map, mapping) => {
return addMappingInternal(false, map, mapping);
};
maybeAddMapping = (map, mapping) => {
return addMappingInternal(true, map, mapping);
};
setSourceContent = (map, source, content) => {
const { _sources: sources, _sourcesContent: sourcesContent } = map;
sourcesContent[put(sources, source)] = content;
};
toDecodedMap = (map) => {
const { file, sourceRoot, _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
removeEmptyFinalLines(mappings);
return {
version: 3,
file: file || undefined,
names: names.array,
sourceRoot: sourceRoot || undefined,
sources: sources.array,
sourcesContent,
mappings,
};
};
toEncodedMap = (map) => {
const decoded = toDecodedMap(map);
return Object.assign(Object.assign({}, decoded), { mappings: encode(decoded.mappings) });
};
allMappings = (map) => {
const out = [];
const { _mappings: mappings, _sources: sources, _names: names } = map;
for (let i = 0; i < mappings.length; i++) {
const line = mappings[i];
for (let j = 0; j < line.length; j++) {
const seg = line[j];
const generated = { line: i + 1, column: seg[COLUMN] };
let source = undefined;
let original = undefined;
let name = undefined;
if (seg.length !== 1) {
source = sources.array[seg[SOURCES_INDEX]];
original = { line: seg[SOURCE_LINE] + 1, column: seg[SOURCE_COLUMN] };
if (seg.length === 5)
name = names.array[seg[NAMES_INDEX]];
}
out.push({ generated, source, original, name });
}
}
return out;
};
fromMap = (input) => {
const map = new TraceMap(input);
const gen = new GenMapping({ file: map.file, sourceRoot: map.sourceRoot });
putAll(gen._names, map.names);
putAll(gen._sources, map.sources);
gen._sourcesContent = map.sourcesContent || map.sources.map(() => null);
gen._mappings = decodedMappings(map);
return gen;
};
// Internal helpers
addSegmentInternal = (skipable, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
const { _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
const line = getLine(mappings, genLine);
const index = getColumnIndex(line, genColumn);
if (!source) {
if (skipable && skipSourceless(line, index))
return;
return insert(line, index, [genColumn]);
}
const sourcesIndex = put(sources, source);
const namesIndex = name ? put(names, name) : NO_NAME;
if (sourcesIndex === sourcesContent.length)
sourcesContent[sourcesIndex] = content !== null && content !== void 0 ? content : null;
if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
return;
}
return insert(line, index, name
? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
: [genColumn, sourcesIndex, sourceLine, sourceColumn]);
};
})();
function getLine(mappings, index) {
for (let i = mappings.length; i <= index; i++) {
mappings[i] = [];
}
return mappings[index];
}
function getColumnIndex(line, genColumn) {
let index = line.length;
for (let i = index - 1; i >= 0; index = i--) {
const current = line[i];
if (genColumn >= current[COLUMN])
break;
}
return index;
}
function insert(array, index, value) {
for (let i = array.length; i > index; i--) {
array[i] = array[i - 1];
}
array[index] = value;
}
function removeEmptyFinalLines(mappings) {
const { length } = mappings;
let len = length;
for (let i = len - 1; i >= 0; len = i, i--) {
if (mappings[i].length > 0)
break;
}
if (len < length)
mappings.length = len;
}
function putAll(strarr, array) {
for (let i = 0; i < array.length; i++)
put(strarr, array[i]);
}
function skipSourceless(line, index) {
// The start of a line is already sourceless, so adding a sourceless segment to the beginning
// doesn't generate any useful information.
if (index === 0)
return true;
const prev = line[index - 1];
// If the previous segment is also sourceless, then adding another sourceless segment doesn't
// genrate any new information. Else, this segment will end the source/named segment and point to
// a sourceless position, which is useful.
return prev.length === 1;
}
function skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex) {
// A source/named segment at the start of a line gives position at that genColumn
if (index === 0)
return false;
const prev = line[index - 1];
// If the previous segment is sourceless, then we're transitioning to a source.
if (prev.length === 1)
return false;
// If the previous segment maps to the exact same source position, then this segment doesn't
// provide any new position information.
return (sourcesIndex === prev[SOURCES_INDEX] &&
sourceLine === prev[SOURCE_LINE] &&
sourceColumn === prev[SOURCE_COLUMN] &&
namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME));
}
function addMappingInternal(skipable, map, mapping) {
const { generated, source, original, name, content } = mapping;
if (!source) {
return addSegmentInternal(skipable, map, generated.line - 1, generated.column, null, null, null, null, null);
}
const s = source;
return addSegmentInternal(skipable, map, generated.line - 1, generated.column, s, original.line - 1, original.column, name, content);
}
export { GenMapping, addMapping, addSegment, allMappings, fromMap, maybeAddMapping, maybeAddSegment, setSourceContent, toDecodedMap, toEncodedMap };
//# sourceMappingURL=gen-mapping.mjs.map

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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@jridgewell/set-array'), require('@jridgewell/sourcemap-codec'), require('@jridgewell/trace-mapping')) :
typeof define === 'function' && define.amd ? define(['exports', '@jridgewell/set-array', '@jridgewell/sourcemap-codec', '@jridgewell/trace-mapping'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.genMapping = {}, global.setArray, global.sourcemapCodec, global.traceMapping));
})(this, (function (exports, setArray, sourcemapCodec, traceMapping) { 'use strict';
const COLUMN = 0;
const SOURCES_INDEX = 1;
const SOURCE_LINE = 2;
const SOURCE_COLUMN = 3;
const NAMES_INDEX = 4;
const NO_NAME = -1;
/**
* A low-level API to associate a generated position with an original source position. Line and
* column here are 0-based, unlike `addMapping`.
*/
exports.addSegment = void 0;
/**
* A high-level API to associate a generated position with an original source position. Line is
* 1-based, but column is 0-based, due to legacy behavior in `source-map` library.
*/
exports.addMapping = void 0;
/**
* Same as `addSegment`, but will only add the segment if it generates useful information in the
* resulting map. This only works correctly if segments are added **in order**, meaning you should
* not add a segment with a lower generated line/column than one that came before.
*/
exports.maybeAddSegment = void 0;
/**
* Same as `addMapping`, but will only add the mapping if it generates useful information in the
* resulting map. This only works correctly if mappings are added **in order**, meaning you should
* not add a mapping with a lower generated line/column than one that came before.
*/
exports.maybeAddMapping = void 0;
/**
* Adds/removes the content of the source file to the source map.
*/
exports.setSourceContent = void 0;
/**
* Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
exports.toDecodedMap = void 0;
/**
* Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
exports.toEncodedMap = void 0;
/**
* Constructs a new GenMapping, using the already present mappings of the input.
*/
exports.fromMap = void 0;
/**
* Returns an array of high-level mapping objects for every recorded segment, which could then be
* passed to the `source-map` library.
*/
exports.allMappings = void 0;
// This split declaration is only so that terser can elminiate the static initialization block.
let addSegmentInternal;
/**
* Provides the state to generate a sourcemap.
*/
class GenMapping {
constructor({ file, sourceRoot } = {}) {
this._names = new setArray.SetArray();
this._sources = new setArray.SetArray();
this._sourcesContent = [];
this._mappings = [];
this.file = file;
this.sourceRoot = sourceRoot;
}
}
(() => {
exports.addSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
return addSegmentInternal(false, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
};
exports.maybeAddSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
return addSegmentInternal(true, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
};
exports.addMapping = (map, mapping) => {
return addMappingInternal(false, map, mapping);
};
exports.maybeAddMapping = (map, mapping) => {
return addMappingInternal(true, map, mapping);
};
exports.setSourceContent = (map, source, content) => {
const { _sources: sources, _sourcesContent: sourcesContent } = map;
sourcesContent[setArray.put(sources, source)] = content;
};
exports.toDecodedMap = (map) => {
const { file, sourceRoot, _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
removeEmptyFinalLines(mappings);
return {
version: 3,
file: file || undefined,
names: names.array,
sourceRoot: sourceRoot || undefined,
sources: sources.array,
sourcesContent,
mappings,
};
};
exports.toEncodedMap = (map) => {
const decoded = exports.toDecodedMap(map);
return Object.assign(Object.assign({}, decoded), { mappings: sourcemapCodec.encode(decoded.mappings) });
};
exports.allMappings = (map) => {
const out = [];
const { _mappings: mappings, _sources: sources, _names: names } = map;
for (let i = 0; i < mappings.length; i++) {
const line = mappings[i];
for (let j = 0; j < line.length; j++) {
const seg = line[j];
const generated = { line: i + 1, column: seg[COLUMN] };
let source = undefined;
let original = undefined;
let name = undefined;
if (seg.length !== 1) {
source = sources.array[seg[SOURCES_INDEX]];
original = { line: seg[SOURCE_LINE] + 1, column: seg[SOURCE_COLUMN] };
if (seg.length === 5)
name = names.array[seg[NAMES_INDEX]];
}
out.push({ generated, source, original, name });
}
}
return out;
};
exports.fromMap = (input) => {
const map = new traceMapping.TraceMap(input);
const gen = new GenMapping({ file: map.file, sourceRoot: map.sourceRoot });
putAll(gen._names, map.names);
putAll(gen._sources, map.sources);
gen._sourcesContent = map.sourcesContent || map.sources.map(() => null);
gen._mappings = traceMapping.decodedMappings(map);
return gen;
};
// Internal helpers
addSegmentInternal = (skipable, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
const { _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
const line = getLine(mappings, genLine);
const index = getColumnIndex(line, genColumn);
if (!source) {
if (skipable && skipSourceless(line, index))
return;
return insert(line, index, [genColumn]);
}
const sourcesIndex = setArray.put(sources, source);
const namesIndex = name ? setArray.put(names, name) : NO_NAME;
if (sourcesIndex === sourcesContent.length)
sourcesContent[sourcesIndex] = content !== null && content !== void 0 ? content : null;
if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
return;
}
return insert(line, index, name
? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
: [genColumn, sourcesIndex, sourceLine, sourceColumn]);
};
})();
function getLine(mappings, index) {
for (let i = mappings.length; i <= index; i++) {
mappings[i] = [];
}
return mappings[index];
}
function getColumnIndex(line, genColumn) {
let index = line.length;
for (let i = index - 1; i >= 0; index = i--) {
const current = line[i];
if (genColumn >= current[COLUMN])
break;
}
return index;
}
function insert(array, index, value) {
for (let i = array.length; i > index; i--) {
array[i] = array[i - 1];
}
array[index] = value;
}
function removeEmptyFinalLines(mappings) {
const { length } = mappings;
let len = length;
for (let i = len - 1; i >= 0; len = i, i--) {
if (mappings[i].length > 0)
break;
}
if (len < length)
mappings.length = len;
}
function putAll(strarr, array) {
for (let i = 0; i < array.length; i++)
setArray.put(strarr, array[i]);
}
function skipSourceless(line, index) {
// The start of a line is already sourceless, so adding a sourceless segment to the beginning
// doesn't generate any useful information.
if (index === 0)
return true;
const prev = line[index - 1];
// If the previous segment is also sourceless, then adding another sourceless segment doesn't
// genrate any new information. Else, this segment will end the source/named segment and point to
// a sourceless position, which is useful.
return prev.length === 1;
}
function skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex) {
// A source/named segment at the start of a line gives position at that genColumn
if (index === 0)
return false;
const prev = line[index - 1];
// If the previous segment is sourceless, then we're transitioning to a source.
if (prev.length === 1)
return false;
// If the previous segment maps to the exact same source position, then this segment doesn't
// provide any new position information.
return (sourcesIndex === prev[SOURCES_INDEX] &&
sourceLine === prev[SOURCE_LINE] &&
sourceColumn === prev[SOURCE_COLUMN] &&
namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME));
}
function addMappingInternal(skipable, map, mapping) {
const { generated, source, original, name, content } = mapping;
if (!source) {
return addSegmentInternal(skipable, map, generated.line - 1, generated.column, null, null, null, null, null);
}
const s = source;
return addSegmentInternal(skipable, map, generated.line - 1, generated.column, s, original.line - 1, original.column, name, content);
}
exports.GenMapping = GenMapping;
Object.defineProperty(exports, '__esModule', { value: true });
}));
//# sourceMappingURL=gen-mapping.umd.js.map

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import type { SourceMapInput } from '@jridgewell/trace-mapping';
import type { DecodedSourceMap, EncodedSourceMap, Pos, Mapping } from './types';
export type { DecodedSourceMap, EncodedSourceMap, Mapping };
export declare type Options = {
file?: string | null;
sourceRoot?: string | null;
};
/**
* A low-level API to associate a generated position with an original source position. Line and
* column here are 0-based, unlike `addMapping`.
*/
export declare let addSegment: {
(map: GenMapping, genLine: number, genColumn: number, source?: null, sourceLine?: null, sourceColumn?: null, name?: null, content?: null): void;
(map: GenMapping, genLine: number, genColumn: number, source: string, sourceLine: number, sourceColumn: number, name?: null, content?: string | null): void;
(map: GenMapping, genLine: number, genColumn: number, source: string, sourceLine: number, sourceColumn: number, name: string, content?: string | null): void;
};
/**
* A high-level API to associate a generated position with an original source position. Line is
* 1-based, but column is 0-based, due to legacy behavior in `source-map` library.
*/
export declare let addMapping: {
(map: GenMapping, mapping: {
generated: Pos;
source?: null;
original?: null;
name?: null;
content?: null;
}): void;
(map: GenMapping, mapping: {
generated: Pos;
source: string;
original: Pos;
name?: null;
content?: string | null;
}): void;
(map: GenMapping, mapping: {
generated: Pos;
source: string;
original: Pos;
name: string;
content?: string | null;
}): void;
};
/**
* Same as `addSegment`, but will only add the segment if it generates useful information in the
* resulting map. This only works correctly if segments are added **in order**, meaning you should
* not add a segment with a lower generated line/column than one that came before.
*/
export declare let maybeAddSegment: typeof addSegment;
/**
* Same as `addMapping`, but will only add the mapping if it generates useful information in the
* resulting map. This only works correctly if mappings are added **in order**, meaning you should
* not add a mapping with a lower generated line/column than one that came before.
*/
export declare let maybeAddMapping: typeof addMapping;
/**
* Adds/removes the content of the source file to the source map.
*/
export declare let setSourceContent: (map: GenMapping, source: string, content: string | null) => void;
/**
* Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
export declare let toDecodedMap: (map: GenMapping) => DecodedSourceMap;
/**
* Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
* a sourcemap, or to JSON.stringify.
*/
export declare let toEncodedMap: (map: GenMapping) => EncodedSourceMap;
/**
* Constructs a new GenMapping, using the already present mappings of the input.
*/
export declare let fromMap: (input: SourceMapInput) => GenMapping;
/**
* Returns an array of high-level mapping objects for every recorded segment, which could then be
* passed to the `source-map` library.
*/
export declare let allMappings: (map: GenMapping) => Mapping[];
/**
* Provides the state to generate a sourcemap.
*/
export declare class GenMapping {
private _names;
private _sources;
private _sourcesContent;
private _mappings;
file: string | null | undefined;
sourceRoot: string | null | undefined;
constructor({ file, sourceRoot }?: Options);
}

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declare type GeneratedColumn = number;
declare type SourcesIndex = number;
declare type SourceLine = number;
declare type SourceColumn = number;
declare type NamesIndex = number;
export declare type SourceMapSegment = [GeneratedColumn] | [GeneratedColumn, SourcesIndex, SourceLine, SourceColumn] | [GeneratedColumn, SourcesIndex, SourceLine, SourceColumn, NamesIndex];
export declare const COLUMN = 0;
export declare const SOURCES_INDEX = 1;
export declare const SOURCE_LINE = 2;
export declare const SOURCE_COLUMN = 3;
export declare const NAMES_INDEX = 4;
export {};

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import type { SourceMapSegment } from './sourcemap-segment';
export interface SourceMapV3 {
file?: string | null;
names: readonly string[];
sourceRoot?: string;
sources: readonly (string | null)[];
sourcesContent?: readonly (string | null)[];
version: 3;
}
export interface EncodedSourceMap extends SourceMapV3 {
mappings: string;
}
export interface DecodedSourceMap extends SourceMapV3 {
mappings: readonly SourceMapSegment[][];
}
export interface Pos {
line: number;
column: number;
}
export declare type Mapping = {
generated: Pos;
source: undefined;
original: undefined;
name: undefined;
} | {
generated: Pos;
source: string;
original: Pos;
name: string;
} | {
generated: Pos;
source: string;
original: Pos;
name: undefined;
};

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{
"name": "@jridgewell/gen-mapping",
"version": "0.3.3",
"description": "Generate source maps",
"keywords": [
"source",
"map"
],
"author": "Justin Ridgewell <justin@ridgewell.name>",
"license": "MIT",
"repository": "https://github.com/jridgewell/gen-mapping",
"main": "dist/gen-mapping.umd.js",
"module": "dist/gen-mapping.mjs",
"types": "dist/types/gen-mapping.d.ts",
"exports": {
".": [
{
"types": "./dist/types/gen-mapping.d.ts",
"browser": "./dist/gen-mapping.umd.js",
"require": "./dist/gen-mapping.umd.js",
"import": "./dist/gen-mapping.mjs"
},
"./dist/gen-mapping.umd.js"
],
"./package.json": "./package.json"
},
"files": [
"dist"
],
"engines": {
"node": ">=6.0.0"
},
"scripts": {
"benchmark": "run-s build:rollup benchmark:*",
"benchmark:install": "cd benchmark && npm install",
"benchmark:only": "node benchmark/index.mjs",
"prebuild": "rm -rf dist",
"build": "run-s -n build:*",
"build:rollup": "rollup -c rollup.config.js",
"build:ts": "tsc --project tsconfig.build.json",
"lint": "run-s -n lint:*",
"lint:prettier": "npm run test:lint:prettier -- --write",
"lint:ts": "npm run test:lint:ts -- --fix",
"pretest": "run-s build:rollup",
"test": "run-s -n test:lint test:coverage",
"test:debug": "mocha --inspect-brk",
"test:lint": "run-s -n test:lint:*",
"test:lint:prettier": "prettier --check '{src,test}/**/*.ts'",
"test:lint:ts": "eslint '{src,test}/**/*.ts'",
"test:only": "mocha",
"test:coverage": "c8 mocha",
"test:watch": "run-p 'build:rollup -- --watch' 'test:only -- --watch'",
"prepublishOnly": "npm run preversion",
"preversion": "run-s test build"
},
"devDependencies": {
"@rollup/plugin-typescript": "8.3.2",
"@types/mocha": "9.1.1",
"@types/node": "17.0.29",
"@typescript-eslint/eslint-plugin": "5.21.0",
"@typescript-eslint/parser": "5.21.0",
"benchmark": "2.1.4",
"c8": "7.11.2",
"eslint": "8.14.0",
"eslint-config-prettier": "8.5.0",
"mocha": "9.2.2",
"npm-run-all": "4.1.5",
"prettier": "2.6.2",
"rollup": "2.70.2",
"typescript": "4.6.3"
},
"dependencies": {
"@jridgewell/set-array": "^1.0.1",
"@jridgewell/sourcemap-codec": "^1.4.10",
"@jridgewell/trace-mapping": "^0.3.9"
}
}