Fix configuration loading (#321)

* Used c12 for configuration loading

* Rebuild

* Removed cfgn dependency

* Fixed tests

__mocks__/c12/index.ts

@@ -0,0 +1 @@
+export const loadConfig = jest.fn();

package.json

@@ -20,7 +20,6 @@
         "@actions/core": "^1.9.1",
         "@actions/exec": "^1.1.1",
         "@actions/github": "^5.0.3",
-        "cfgn": "^0.1.3",
         "fs-extra": "^10.0.0",
         "markdown-table": "^2.0.0",
         "micromatch": "^4.0.4",
@@ -38,6 +37,7 @@
         "@types/semver": "^7.3.9",
         "@typescript-eslint/eslint-plugin": "^4.12.0",
         "@typescript-eslint/parser": "^4.12.0",
+        "c12": "^0.2.13",
         "esbuild": "^0.12.24",
         "eslint": "^7.17.0",
         "eslint-config-prettier": "^7.1.0",

src/utils/parseJestConfig.ts

@@ -1,26 +1,12 @@
-import { resolve } from 'path';
+import { loadConfig } from 'c12';
 
-import { parseConfigurations, PossibleConfiguration } from 'cfgn';
+export const parseJestConfig = async (
+    workingDirectory: string
+): Promise<unknown> => {
+    const { config } = await loadConfig({
+        cwd: workingDirectory,
+        name: 'jest',
+    });
 
-// These constants are taken from "jest-config" module, file "constants.js"
-const JEST_CONFIG_BASE_NAME = 'jest.config';
-const JEST_CONFIG_EXT_ORDER = Object.freeze([
-    '.js',
-    '.ts',
-    '.mjs',
-    '.cjs',
-    '.json',
-]);
-
-export const parseJestConfig = (workingDirectory: string): Promise<unknown> => {
-    const possibleJestConfigs: PossibleConfiguration[] = JEST_CONFIG_EXT_ORDER.map(
-        (extension) => ({
-            path: resolve(
-                workingDirectory,
-                JEST_CONFIG_BASE_NAME.concat(extension)
-            ),
-        })
-    );
-
-    return parseConfigurations(possibleJestConfigs);
+    return config;
 };

tests/run.test.ts

@@ -1,6 +1,7 @@
 import * as allCore from '@actions/core';
 import * as all from '@actions/github';
 import { getOctokit } from '@actions/github';
+import { loadConfig } from 'c12';
 import { mocked } from 'ts-jest/utils';
 
 import { Annotation } from '../src/annotations/Annotation';
@@ -215,6 +216,7 @@ const getOptionsMock = mocked(getOptions);
 const getCoverageMock = mocked(getCoverage);
 const switchBranchMock = mocked(switchBranch);
 const createReportMock = mocked(createReport);
+const loadConfigMock = mocked(loadConfig);
 
 (getOctokit as jest.Mock<any, any>).mockReturnValue({
     rest: {
@@ -232,12 +234,16 @@ beforeEach(() => {
     getCoverageMock.mockClear();
     createReportMock.mockClear();
     (setFailed as jest.Mock).mockClear();
+    loadConfigMock.mockClear();
 
     getOptionsMock.mockResolvedValue(defaultOptions);
     getCoverageMock.mockResolvedValue(standardReport);
     createReportMock.mockReturnValue({
         runReport: {} as TestRunReport,
     } as SummaryReport);
+    loadConfigMock.mockResolvedValue({
+        config: {},
+    });
     clearContextMock();
 });