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istanbul-lib-source-maps
Advanced tools
The istanbul-lib-source-maps package is used for handling source maps in the context of the Istanbul code coverage tool. It allows for the generation, manipulation, and consumption of source maps, which are files that map from the transformed source to the original source, enabling the accurate reporting of code coverage for projects that use transpilers or minifiers.
Source Map Consumption
This feature allows for the consumption of source maps by registering them with a source map store. This is useful for tools that need to map coverage information back to the original source files.
const sourceMaps = require('istanbul-lib-source-maps');
const mapStore = sourceMaps.createSourceMapStore();
mapStore.registerURL('compiled.js', 'compiled.js.map');
Source Map Generation
This feature enables the generation of source maps. It's particularly useful for developers who are compiling or transforming their code and need to produce source maps for accurate code coverage reporting.
const {SourceMapGenerator} = require('istanbul-lib-source-maps');
let generator = new SourceMapGenerator({file: 'output.js'});
generator.addMapping({
generated: {line: 1, column: 0},
source: 'input.js',
original: {line: 1, column: 0}
});
let map = generator.toString();
Applying Source Maps to Coverage Data
This feature involves applying source maps to coverage data to remap coverage reports back to the original source code. This is crucial for accurate coverage reporting in projects that use transpilation or other code transformations.
const sourceMaps = require('istanbul-lib-source-maps');
const mapStore = sourceMaps.createSourceMapStore();
mapStore.registerURL('compiled.js', 'compiled.js.map');
const transformedCoverage = mapStore.transformCoverage(mapStore.loadCoverage(coverageObject));
The source-map package provides functionalities for generating and consuming source maps. It is a lower-level library compared to istanbul-lib-source-maps, which is specifically tailored for use with Istanbul's code coverage tools. source-map is more general-purpose and can be used in a wider range of applications.
remap-istanbul is a tool for remapping code coverage information using source maps. It serves a similar purpose to istanbul-lib-source-maps but operates as a standalone tool rather than a library. It can be used to generate remapped coverage reports in various formats.
Source map support for istanbuljs.
istanbul-lib-source-maps uses the debug module.
Run your application with the environment variable DEBUG=istanbuljs
, to receive debug
output.
FAQs
Source maps support for istanbul
The npm package istanbul-lib-source-maps receives a total of 26,032,354 weekly downloads. As such, istanbul-lib-source-maps popularity was classified as popular.
We found that istanbul-lib-source-maps demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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