fix: resolve from and to from config and options (#467)

BREAKING CHANGE: `from` and `to` options are resolved now

src/index.js

@@ -74,10 +74,7 @@ export default async function loader(content, sourceMap) {
     processOptions.map = { inline: false, annotation: false };
 
     if (sourceMap) {
-      processOptions.map.prev = normalizeSourceMap(
-        sourceMap,
-        this.resourcePath
-      );
+      processOptions.map.prev = normalizeSourceMap(sourceMap, this.context);
     }
   } else if (sourceMap && typeof processOptions.map !== 'undefined') {
     if (typeof processOptions.map === 'boolean') {
@@ -128,7 +125,7 @@ export default async function loader(content, sourceMap) {
   let map = result.map ? result.map.toJSON() : undefined;
 
   if (map && useSourceMap) {
-    map = normalizeSourceMapAfterPostcss(map, this.resourcePath);
+    map = normalizeSourceMapAfterPostcss(map, this.context);
   }
 
   const ast = {

src/utils.js

@@ -192,18 +192,45 @@ function getPostcssOptions(loaderContext, config, postcssOptions = {}) {
 
   const processOptionsFromConfig = { ...config };
 
+  if (processOptionsFromConfig.from) {
+    processOptionsFromConfig.from = path.resolve(
+      path.dirname(config.file),
+      processOptionsFromConfig.from
+    );
+  }
+
+  if (processOptionsFromConfig.to) {
+    processOptionsFromConfig.to = path.resolve(
+      path.dirname(config.file),
+      processOptionsFromConfig.to
+    );
+  }
+
   // No need them for processOptions
   delete processOptionsFromConfig.plugins;
   delete processOptionsFromConfig.file;
 
   const processOptionsFromOptions = { ...normalizedPostcssOptions };
 
+  if (processOptionsFromOptions.from) {
+    processOptionsFromOptions.from = path.resolve(
+      loaderContext.rootContext,
+      processOptionsFromOptions.from
+    );
+  }
+
+  if (processOptionsFromOptions.to) {
+    processOptionsFromOptions.to = path.resolve(
+      loaderContext.rootContext,
+      processOptionsFromOptions.to
+    );
+  }
+
   // No need them for processOptions
   delete processOptionsFromOptions.config;
   delete processOptionsFromOptions.plugins;
 
   const processOptions = {
-    // TODO path.resolve
     from: file,
     to: file,
     map: false,
@@ -272,7 +299,7 @@ function getURLType(source) {
   return ABSOLUTE_SCHEME.test(source) ? 'absolute' : 'path-relative';
 }
 
-function normalizeSourceMap(map, resourcePath) {
+function normalizeSourceMap(map, resourceContext) {
   let newMap = map;
 
   // Some loader emit source map as string
@@ -298,7 +325,7 @@ function normalizeSourceMap(map, resourcePath) {
             ? path.resolve(sourceRoot, path.normalize(source))
             : path.normalize(source);
 
-        return path.relative(path.dirname(resourcePath), absoluteSource);
+        return path.relative(resourceContext, absoluteSource);
       }
 
       return source;
@@ -308,7 +335,7 @@ function normalizeSourceMap(map, resourcePath) {
   return newMap;
 }
 
-function normalizeSourceMapAfterPostcss(map, resourcePath) {
+function normalizeSourceMapAfterPostcss(map, resourceContext) {
   const newMap = map;
 
   // result.map.file is an optional property that provides the output filename.
@@ -329,9 +356,7 @@ function normalizeSourceMapAfterPostcss(map, resourcePath) {
 
     // Do no touch `scheme-relative`, `path-absolute` and `absolute` types
     if (sourceType === 'path-relative') {
-      const dirname = path.dirname(resourcePath);
-
-      return path.resolve(dirname, source);
+      return path.resolve(resourceContext, source);
     }
 
     return source;

test/__snapshots__/config.test.js.snap

@@ -31,6 +31,40 @@ exports[`"config" option should work "String" value (relative path): errors 1`]
 
 exports[`"config" option should work "String" value (relative path): warnings 1`] = `Array []`;
 
+exports[`"config" option should work and resolve "from" and "to" options: css 1`] = `
+"a { color: black }
+
+.foo {
+  float: right;
+}
+"
+`;
+
+exports[`"config" option should work and resolve "from" and "to" options: errors 1`] = `Array []`;
+
+exports[`"config" option should work and resolve "from" and "to" options: source map 1`] = `
+Object {
+  "file": "style.css",
+  "mappings": "AAAA,IAAI,aAAa;;AAEjB;EACE,YAAY;AACd",
+  "names": Array [],
+  "sourceRoot": "",
+  "sources": Array [
+    "style.css",
+  ],
+  "sourcesContent": Array [
+    "a { color: black }
+
+.foo {
+  float: right;
+}
+",
+  ],
+  "version": 3,
+}
+`;
+
+exports[`"config" option should work and resolve "from" and "to" options: warnings 1`] = `Array []`;
+
 exports[`"config" option should work with "String" value (absolute path): css 1`] = `
 "a { color: rgba(0, 0, 0, 1.0) }
 

test/__snapshots__/postcssOptins.test.js.snap

@@ -153,7 +153,7 @@ exports[`"postcssOptions" option should work "Function" value: errors 1`] = `Arr
 
 exports[`"postcssOptions" option should work "Function" value: warnings 1`] = `Array []`;
 
-exports[`"postcssOptions" option should work with "from", "to" and "map" options: css 1`] = `
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (absolute paths): css 1`] = `
 "a {
   color: black;
 }
@@ -200,11 +200,64 @@ a {
 "
 `;
 
-exports[`"postcssOptions" option should work with "from", "to" and "map" options: errors 1`] = `Array []`;
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (absolute paths): errors 1`] = `Array []`;
 
-exports[`"postcssOptions" option should work with "from", "to" and "map" options: map 1`] = `undefined`;
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (absolute paths): map 1`] = `undefined`;
 
-exports[`"postcssOptions" option should work with "from", "to" and "map" options: warnings 1`] = `Array []`;
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (absolute paths): warnings 1`] = `Array []`;
+
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (relative paths): css 1`] = `
+"a {
+  color: black;
+}
+
+a {
+  color: red;
+}
+
+a {
+  color: green;
+}
+
+a {
+  color: blue;
+}
+
+.class {
+  -x-border-color: blue blue *;
+  -x-color: * #fafafa;
+}
+
+.class-foo {
+  -z-border-color: blue blue *;
+  -z-color: * #fafafa;
+}
+
+.phone {
+  &_title {
+    width: 500px;
+
+    @media (max-width: 500px) {
+      width: auto;
+    }
+
+    body.is_dark & {
+      color: white;
+    }
+  }
+
+  img {
+    display: block;
+  }
+}
+"
+`;
+
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (relative paths): errors 1`] = `Array []`;
+
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (relative paths): map 1`] = `undefined`;
+
+exports[`"postcssOptions" option should work with "from", "to" and "map" options (relative paths): warnings 1`] = `Array []`;
 
 exports[`"postcssOptions" option should work with the "map" option and generate inlined source maps: css 1`] = `
 "a {

test/config-autoload.test.js

@@ -35,12 +35,8 @@ describe('autoload config', () => {
       expect(config.parser).toEqual(false);
       expect(config.syntax).toEqual(false);
       expect(config.map).toEqual(false);
-      expect(config.from).toEqual(
-        './test/fixtures/config-autoload/pkg/index.css'
-      );
-      expect(config.to).toEqual(
-        './test/fixtures/config-autoload/pkg/expected/index.css'
-      );
+      expect(config.from).toEqual('./index.css');
+      expect(config.to).toEqual('./index.css');
       expect(Object.keys(config.plugins).length).toEqual(2);
       expect(config.file).toEqual(
         path.resolve(testDirectory, 'pkg', 'package.json')

test/config.test.js

@@ -191,4 +191,31 @@ describe('"config" option', () => {
     expect(getWarnings(stats)).toMatchSnapshot('warnings');
     expect(getErrors(stats, true)).toMatchSnapshot('errors');
   });
+
+  it('should work and resolve "from" and "to" options', async () => {
+    const compiler = getCompiler('./config-scope/css/index.js', {
+      postcssOptions: {
+        config: path.resolve(
+          __dirname,
+          './fixtures/config-scope/from-to/postcss.config.js'
+        ),
+      },
+    });
+    const stats = await compile(compiler);
+
+    const { css, sourceMap } = getCodeFromBundle('style.css', stats);
+
+    sourceMap.sourceRoot = '';
+    sourceMap.sources = sourceMap.sources.map((source) => {
+      expect(path.isAbsolute(source)).toBe(false);
+      expect(source).toBe(path.normalize(source));
+
+      return source.replace(/\\/g, '/');
+    });
+
+    expect(css).toMatchSnapshot('css');
+    expect(sourceMap).toMatchSnapshot('source map');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+  });
 });

test/fixtures/config-autoload/pkg/package.json

@@ -5,8 +5,8 @@
     "parser": false,
     "syntax": false,
     "map": false,
-    "from": "./test/fixtures/config-autoload/pkg/index.css",
-    "to": "./test/fixtures/config-autoload/pkg/expected/index.css",
+    "from": "./index.css",
+    "to": "./index.css",
     "plugins": [
       "postcss-import",
       ["postcss-nested", {}]

test/fixtures/config-scope/from-to/postcss.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  from: '../../css/style.css',
+  to: '../../css/style.css',
+  map: {
+    inline: false,
+    annotation: false,
+    sourcesContent: true,
+  },
+  plugins: [
+    ['postcss-short', { prefix: 'x' }]
+  ]
+};

test/postcssOptins.test.js

@@ -7,7 +7,7 @@ import {
 } from './helpers';
 
 describe('"postcssOptions" option', () => {
-  it('should work with "from", "to" and "map" options', async () => {
+  it('should work with "from", "to" and "map" options (absolute paths)', async () => {
     const compiler = getCompiler('./css/index.js', {
       postcssOptions: {
         from: '/test/from.css',
@@ -16,25 +16,37 @@ describe('"postcssOptions" option', () => {
       },
     });
     const stats = await compile(compiler);
-
     const codeFromBundle = getCodeFromBundle('style.css', stats);
-    const notNormalizecodeFromBundle = getCodeFromBundle(
-      'style.css',
-      stats,
-      false
-    );
-
-    const toIsWork = notNormalizecodeFromBundle.sourceMap.file.endsWith(
-      'to.css'
-    );
+    const toIsWork = codeFromBundle.sourceMap.file.endsWith('to.css');
     const fromIsWork =
-      notNormalizecodeFromBundle.sourceMap.sources.filter((i) =>
-        i.endsWith('from.css')
-      ).length > 0;
+      codeFromBundle.sourceMap.sources.filter((i) => i.endsWith('from.css'))
+        .length > 0;
 
     expect(toIsWork).toBe(true);
     expect(fromIsWork).toBe(true);
+    expect(codeFromBundle.css).toMatchSnapshot('css');
+    expect(codeFromBundle.map).toMatchSnapshot('map');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+  });
+
+  it('should work with "from", "to" and "map" options (relative paths)', async () => {
+    const compiler = getCompiler('./css/index.js', {
+      postcssOptions: {
+        from: './css/style.css',
+        to: './css/style.css',
+        map: { inline: false, annotation: false },
+      },
+    });
+    const stats = await compile(compiler);
+    const codeFromBundle = getCodeFromBundle('style.css', stats);
+    const toIsWork = codeFromBundle.sourceMap.file.endsWith('style.css');
+    const fromIsWork =
+      codeFromBundle.sourceMap.sources.filter((i) => i.endsWith('style.css'))
+        .length > 0;
 
+    expect(toIsWork).toBe(true);
+    expect(fromIsWork).toBe(true);
     expect(codeFromBundle.css).toMatchSnapshot('css');
     expect(codeFromBundle.map).toMatchSnapshot('map');
     expect(getWarnings(stats)).toMatchSnapshot('warnings');