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feat: filter source mapping url
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‎README.md‎

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@@ -48,16 +48,70 @@ module.exports = {
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};
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```
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`source-map-loader` extracts existing source maps from all JavaScript entries.
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The `source-map-loader` extracts existing source maps from all JavaScript entries.
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This includes both inline source maps as well as those linked via URL.
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All source map data is passed to webpack for processing as per a chosen [source map style](https://webpack.js.org/configuration/devtool/) specified by the `devtool` option in [webpack.config.js](https://webpack.js.org/configuration/).
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This loader is especially useful when using 3rd-party libraries having their own source maps.
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If not extracted and processed into the source map of the webpack bundle, browsers may misinterpret source map data. `source-map-loader` allows webpack to maintain source map data continuity across libraries so ease of debugging is preserved.
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`source-map-loader` will extract from any JavaScript file, including those in the `node_modules` directory.
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The `source-map-loader` will extract from any JavaScript file, including those in the `node_modules` directory.
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Be mindful in setting [include](https://webpack.js.org/configuration/module/#rule-include) and [exclude](https://webpack.js.org/configuration/module/#rule-exclude) rule conditions to maximize bundling performance.
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And run `webpack` via your preferred method.
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## Options
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| Name | Type | Default | Description |
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| :----------------------------------: | :----------: | :---------: | :--------------------------------------------- |
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| **[`filterSourceMappingUrl`](#url)** | `{Function}` | `undefined` | Allows to control `SourceMappingURL` behaviour |
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### filterSourceMappingUrl
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Type: `Function`
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Default: `undefined`
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Allows you to specify the behavior of the loader for `SourceMappingURL` comment.
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The function must return one of the values:
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- `true` or `'consume'` - consume the source map and remove `SourceMappingURL` comment (default behavior)
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- `false` or `'remove'` - do not consume the source map and remove `SourceMappingURL` comment
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- `skip` - do not consume the source map and do not remove `SourceMappingURL` comment
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Example configuration:
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**webpack.config.js**
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```js
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module.exports = {
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module: {
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rules: [
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{
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test: /\.js$/,
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enforce: 'pre',
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use: [
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{
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loader: 'source-map-loader',
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options: {
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filterSourceMappingUrl: (url, resourcePath) => {
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if (/broker-source-map-url\.js$/i.test(url)) {
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return false;
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}
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if (/keep-source-mapping-url\.js$/i.test(resourcePath)) {
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return 'skip';
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}
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return true;
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},
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},
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},
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],
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},
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],
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},
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};
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```
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## Examples
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### Ignoring Warnings

‎src/index.js‎

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@@ -19,6 +19,7 @@ export default async function loader(input, inputMap) {
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});
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const { sourceMappingURL, replacementString } = getSourceMappingURL(input);
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const callback = this.async();
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if (!sourceMappingURL) {
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return;
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}
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let behaviourSourceMappingUrl;
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try {
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behaviourSourceMappingUrl =
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typeof options.filterSourceMappingUrl !== 'undefined'
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? options.filterSourceMappingUrl(sourceMappingURL, this.resourcePath)
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: 'consume';
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} catch (error) {
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callback(error);
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return;
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}
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// eslint-disable-next-line default-case
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switch (behaviourSourceMappingUrl) {
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case 'skip':
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callback(null, input, inputMap);
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return;
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case false:
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case 'remove':
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callback(null, input.replace(replacementString, ''), inputMap);
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return;
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}
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let sourceURL;
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let sourceContent;
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‎src/options.json‎

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{
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"type": "object",
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"additionalProperties": false
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"additionalProperties": false,
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"properties": {
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"filterSourceMappingUrl": {
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"instanceof": "Function"
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}
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}
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}

‎test/__snapshots__/filterSourceMappingUrl.test.js.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`filterSourceMappingUrl option should emit error: errors 1`] = `
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Array [
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"ModuleBuildError: Module build failed (from \`replaced original path\`):
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Error: error",
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]
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`;
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exports[`filterSourceMappingUrl option should emit error: warnings 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with "remove" value: css 1`] = `
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"with SourceMap
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// comment
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"
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`;
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exports[`filterSourceMappingUrl option should work with "remove" value: errors 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with "remove" value: warnings 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with "skip" value: css 1`] = `
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"with SourceMap
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//#sourceMappingURL=http://sampledomain.com/external-source-map2.map
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// comment
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"
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`;
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exports[`filterSourceMappingUrl option should work with "skip" value: errors 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with "skip" value: warnings 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with false value: css 1`] = `
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"with SourceMap
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// comment
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"
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`;
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exports[`filterSourceMappingUrl option should work with false value: errors 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with false value: warnings 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with true value: css 1`] = `
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"with SourceMap
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// comment"
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`;
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exports[`filterSourceMappingUrl option should work with true value: errors 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work with true value: map 1`] = `
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Object {
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"file": "external-source-map.js",
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"mappings": "AAAA",
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"sources": Array [
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"/test/fixtures/external-source-map.txt - (normalized for test)",
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],
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"sourcesContent": Array [
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"with SourceMap",
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],
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"version": 3,
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}
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`;
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exports[`filterSourceMappingUrl option should work with true value: warnings 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work: css 1`] = `
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"with SourceMap
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// comment"
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`;
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exports[`filterSourceMappingUrl option should work: errors 1`] = `Array []`;
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exports[`filterSourceMappingUrl option should work: map 1`] = `
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Object {
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"file": "external-source-map.js",
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"mappings": "AAAA",
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"sources": Array [
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"/test/fixtures/external-source-map.txt - (normalized for test)",
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],
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"sourcesContent": Array [
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"with SourceMap",
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],
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"version": 3,
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}
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`;
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exports[`filterSourceMappingUrl option should work: warnings 1`] = `Array []`;

‎test/__snapshots__/validate-options.test.js.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "/test/" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "[]" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "{"foo":"bar"}" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "{}" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "1" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "false" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "test" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "filterSourceMappingUrl" option with "true" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options.filterSourceMappingUrl should be an instance of function."
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`;
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exports[`validate options should throw an error on the "unknown" option with "/test/" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "[]" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "{"foo":"bar"}" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "{}" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "1" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "false" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "test" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;
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exports[`validate options should throw an error on the "unknown" option with "true" value 1`] = `
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"Invalid options object. Source Map Loader has been initialized using an options object that does not match the API schema.
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- options has an unknown property 'unknown'. These properties are valid:
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object {}"
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object { filterSourceMappingUrl? }"
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`;

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