...

Author: igalklebanov

.github/workflows/test.yml

@@ -273,8 +273,11 @@ jobs:
       - name: Install Typescript (${{ env.TS_VERSION }}) and TSD (${{ env.TSD_VERSION }})
         run: pnpm i -D typescript@${{ env.TS_VERSION }} tsd@${{ env.TSD_VERSION }}
 
+        name: Make `tsconfig` backwards compatible.
+      - run: pnpm script:override-tsconfig-target
+
       - name: Run tests with older TypeScript version
-        run: pnpm test:typings && pnpm tsc -p test/node${{ env.TS_VERSION == '~5.4.0' && '/tsconfig-5.4.json' || '' }}
+        run: pnpm test:typings && pnpm test:node:build
 
   jsdocs:
     name: JSDocs

package.json

@@ -106,6 +106,7 @@
     "script:add-deno-type-references": "node scripts/add-deno-type-references.cjs",
     "script:align-versions": "node --experimental-strip-types scripts/align-versions.mts",
     "script:generate-site-examples": "node scripts/generate-site-examples.cjs",
+    "script:override-tsconfig-target": "node --experimental-strip-types scripts/override-tsconfig-target.mts",
     "script:remove-global-augmentations": "node --experimental-strip-types scripts/remove-global-augmentations.mts",
     "prepublishOnly": "pnpm build && pnpm test:exports",
     "version": "pnpm script:align-versions && git add ."

scripts/override-tsconfig-target.mts

@@ -0,0 +1,25 @@
+import { writeFile } from 'node:fs/promises'
+import { fileURLToPath } from 'node:url'
+import { dirname, join } from 'pathe'
+import { lt } from 'semver'
+import packageJson from '../package.json'
+import tsconfig from '../tsconfig-base.json'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+
+// <=5.4.0 supports target <= es2022.
+if (lt(packageJson.devDependencies.typescript.replace(/^[~^]/, ''), '5.5.0')) {
+  const { compilerOptions } = tsconfig
+
+  const originalTarget = compilerOptions.target
+
+  compilerOptions.target = 'es2022'
+
+  await writeFile(
+    join(__dirname, '../tsconfig-base.json'),
+    JSON.stringify(tsconfig),
+    { encoding: 'utf8' },
+  )
+
+  console.log(`tsconfig-base.json: target:${originalTarget}->target:es2022`)
+}