feat(config): add support for multiple paths in module name mapper

Author: OrkhanAlikhanov

src/config/paths-to-module-name-mapper.spec.ts

@@ -5,23 +5,31 @@ import { pathsToModuleNameMapper } from './paths-to-module-name-mapper'
 const tsconfigMap = {
   log: ['src/util/log'],
   server: ['src/server'],
+  client: ['src/client', 'src/client/index'],
   'util/*': ['src/util/*'],
   'api/*': ['src/api/*'],
   'test/*': ['test/*'],
   'mocks/*': ['test/mocks/*'],
-  'test/*/mock': ['test/mocks/*'],
+  'test/*/mock': ['test/mocks/*', 'test/__mocks__/*'],
 }
 
 describe('pathsToModuleNameMapper', () => {
   it('should convert tsconfig mapping', () => {
     expect(pathsToModuleNameMapper(tsconfigMap)).toMatchInlineSnapshot(`
 Object {
   "^api/(.*)$": "src/api/$1",
+  "^client$": Array [
+    "src/client",
+    "src/client/index",
+  ],
   "^log$": "src/util/log",
   "^mocks/(.*)$": "test/mocks/$1",
   "^server$": "src/server",
   "^test/(.*)$": "test/$1",
-  "^test/(.*)/mock$": "test/mocks/$1",
+  "^test/(.*)/mock$": Array [
+    "test/mocks/$1",
+    "test/__mocks__/$1",
+  ],
   "^util/(.*)$": "src/util/$1",
 }
 `)
@@ -31,11 +39,18 @@ Object {
     expect(pathsToModuleNameMapper(tsconfigMap, { prefix: '<rootDir>/' })).toMatchInlineSnapshot(`
 Object {
   "^api/(.*)$": "<rootDir>/src/api/$1",
+  "^client$": Array [
+    "<rootDir>/src/client",
+    "<rootDir>/src/client/index",
+  ],
   "^log$": "<rootDir>/src/util/log",
   "^mocks/(.*)$": "<rootDir>/test/mocks/$1",
   "^server$": "<rootDir>/src/server",
   "^test/(.*)$": "<rootDir>/test/$1",
-  "^test/(.*)/mock$": "<rootDir>/test/mocks/$1",
+  "^test/(.*)/mock$": Array [
+    "<rootDir>/test/mocks/$1",
+    "<rootDir>/test/__mocks__/$1",
+  ],
   "^util/(.*)$": "<rootDir>/src/util/$1",
 }
 `)
@@ -48,20 +63,16 @@ Object {
       pathsToModuleNameMapper({
         kept: ['src/kept'],
         'no-target': [],
-        'too-many-target': ['one', 'two'],
         'too/*/many/*/stars': ['to/*/many/*/stars'],
       }),
     ).toMatchInlineSnapshot(`
 Object {
   "^kept$": "src/kept",
-  "^too\\\\-many\\\\-target$": "one",
 }
 `)
     expect(log.lines.warn).toMatchInlineSnapshot(`
 Array [
   "[level:40] Not mapping \\"no-target\\" because it has no target.
-",
-  "[level:40] Mapping only to first target of \\"too-many-target\\" because it has more than one (2).
 ",
   "[level:40] Not mapping \\"too/*/many/*/stars\\" because it has more than one star (\`*\`).
 ",

src/config/paths-to-module-name-mapper.ts

@@ -26,24 +26,18 @@ export const pathsToModuleNameMapper = (
     if (toPaths.length === 0) {
       logger.warn(interpolate(Errors.NotMappingPathWithEmptyMap, { path: fromPath }))
       continue
-    } else if (toPaths.length > 1) {
-      logger.warn(
-        interpolate(Errors.MappingOnlyFirstTargetOfPath, {
-          path: fromPath,
-          count: toPaths.length,
-        }),
-      )
     }
-    const target = toPaths[0]
 
     // split with '*'
     const segments = fromPath.split(/\*/g)
     if (segments.length === 1) {
+      const paths = toPaths.map((target) => `${prefix}${target}`)
       pattern = `^${escapeRegex(fromPath)}$`
-      jestMap[pattern] = `${prefix}${target}`
+      jestMap[pattern] = paths.length === 1 ? paths[0] : paths
     } else if (segments.length === 2) {
+      const paths = toPaths.map((target) => `${prefix}${target.replace(/\*/g, '$1')}`)
       pattern = `^${escapeRegex(segments[0])}(.*)${escapeRegex(segments[1])}$`
-      jestMap[pattern] = `${prefix}${target.replace(/\*/g, '$1')}`
+      jestMap[pattern] = paths.length === 1 ? paths[0] : paths
     } else {
       logger.warn(interpolate(Errors.NotMappingMultiStarPath, { path: fromPath }))
       continue

src/util/messages.ts

@@ -12,7 +12,6 @@ export const enum Errors {
   UnableToCompileTypeScript = '{{diagnostics}}',
   NotMappingMultiStarPath = 'Not mapping "{{path}}" because it has more than one star (`*`).',
   NotMappingPathWithEmptyMap = 'Not mapping "{{path}}" because it has no target.',
-  MappingOnlyFirstTargetOfPath = 'Mapping only to first target of "{{path}}" because it has more than one ({{count}}).',
   GotJsFileButAllowJsFalse = 'Got a `.js` file to compile while `allowJs` option is not set to `true` (file: {{path}}). To fix this:\n  - if you want TypeScript to process JS files, set `allowJs` to `true` in your TypeScript config (usually tsconfig.json)\n  - if you do not want TypeScript to process your `.js` files, in your Jest config change the `transform` key which value is `ts-jest` so that it does not match `.js` files anymore',
   GotUnknownFileTypeWithoutBabel = 'Got a unknown file type to compile (file: {{path}}). To fix this, in your Jest config change the `transform` key which value is `ts-jest` so that it does not match this kind of files anymore.',
   GotUnknownFileTypeWithBabel = 'Got a unknown file type to compile (file: {{path}}). To fix this, in your Jest config change the `transform` key which value is `ts-jest` so that it does not match this kind of files anymore. If you still want Babel to process it, add another entry to the `transform` option with value `babel-jest` which key matches this type of files.',