feat(typescript): Move to BuilderProgram API

.gitignore

@@ -13,3 +13,4 @@ pnpm-debug.log
 !packages/node-resolve/test/fixtures/**/node_modules
 !packages/commonjs/test/**/node_modules
 !packages/typescript/test/fixtures/**/node_modules
+!packages/typescript/test/fixtures/**/dist

packages/typescript/README.md

@@ -108,7 +108,7 @@ Overrides the injected TypeScript helpers with a custom version.
 
 ```js
 typescript({
-  tslib: fs.readFileSync(require.resolve('some-fork-of-tslib'))
+  tslib: require.resolve('some-fork-of-tslib')
 });
 ```
 
@@ -134,8 +134,6 @@ Declaration files are automatically included if they are listed in the `files` f
 
 These compiler options are ignored by Rollup:
 
-- `declaration`, `declarationMap`: This plugin currently cannot emit declaration files.
-- `incremental`, `tsBuildInfoFile`: This plugin currently does not support incremental compilation using Typescript.
 - `noEmitHelpers`, `importHelpers`: The `tslib` helper module always must be used.
 - `noEmit`, `emitDeclarationOnly`: Typescript needs to emit code for the plugin to work with.
 - `noResolve`: Preventing Typescript from resolving code may break compilation

packages/typescript/package.json

@@ -19,7 +19,7 @@
     "ci:coverage": "nyc pnpm run test && nyc report --reporter=text-lcov > coverage.lcov",
     "ci:lint": "pnpm run build && pnpm run lint",
     "ci:lint:commits": "commitlint --from=${CIRCLE_BRANCH} --to=${CIRCLE_SHA1}",
-    "ci:test": "pnpm run test -- --verbose",
+    "ci:test": "pnpm run test -- --verbose --serial",
     "lint": "pnpm run lint:js && pnpm run lint:docs && pnpm run lint:package",
     "lint:docs": "prettier --single-quote --write README.md",
     "lint:js": "eslint --fix --cache src test --ext .js,.ts",

packages/typescript/src/diagnostics/emit.ts

@@ -6,29 +6,49 @@ import diagnosticToWarning from './toWarning';
 // `Cannot compile modules into 'es6' when targeting 'ES5' or lower.`
 const CANNOT_COMPILE_ESM = 1204;
 
+/**
+ * Emit a Rollup warning or error for a Typescript type error.
+ */
+export function emitDiagnostic(
+  ts: typeof import('typescript'),
+  context: PluginContext,
+  host: DiagnosticsHost,
+  diagnostic: import('typescript').Diagnostic
+) {
+  if (diagnostic.code === CANNOT_COMPILE_ESM) return;
+
+  const { noEmitOnError } = host.getCompilationSettings();
+
+  // Build a Rollup warning object from the diagnostics object.
+  const warning = diagnosticToWarning(ts, host, diagnostic);
+
+  // Errors are fatal. Otherwise emit warnings.
+  if (noEmitOnError && diagnostic.category === ts.DiagnosticCategory.Error) {
+    context.error(warning);
+  } else {
+    context.warn(warning);
+  }
+}
+
+export function buildDiagnosticReporter(
+  ts: typeof import('typescript'),
+  context: PluginContext,
+  host: DiagnosticsHost
+): import('typescript').DiagnosticReporter {
+  return function reportDiagnostics(diagnostic) {
+    emitDiagnostic(ts, context, host, diagnostic);
+  };
+}
+
 /**
  * For each type error reported by Typescript, emit a Rollup warning or error.
  */
-export default function emitDiagnostics(
+export function emitDiagnostics(
   ts: typeof import('typescript'),
   context: PluginContext,
   host: DiagnosticsHost,
   diagnostics: readonly import('typescript').Diagnostic[] | undefined
 ) {
   if (!diagnostics) return;
-  const { noEmitOnError } = host.getCompilationSettings();
-
-  diagnostics
-    .filter((diagnostic) => diagnostic.code !== CANNOT_COMPILE_ESM)
-    .forEach((diagnostic) => {
-      // Build a Rollup warning object from the diagnostics object.
-      const warning = diagnosticToWarning(ts, host, diagnostic);
-
-      // Errors are fatal. Otherwise emit warnings.
-      if (noEmitOnError && diagnostic.category === ts.DiagnosticCategory.Error) {
-        context.error(warning);
-      } else {
-        context.warn(warning);
-      }
-    });
+  diagnostics.forEach(buildDiagnosticReporter(ts, context, host));
 }

packages/typescript/src/index.ts

@@ -1,83 +1,112 @@
 import * as path from 'path';
 
-import { Plugin } from 'rollup';
+import { Plugin, SourceDescription } from 'rollup';
 
 import { RollupTypescriptOptions } from '../types';
 
-import emitDiagnostics from './diagnostics/emit';
 import createFormattingHost from './diagnostics/host';
-import getDocumentRegistry from './documentRegistry';
-import createHost from './host';
-import { emitParsedOptionsErrors, getPluginOptions, parseTypescriptConfig } from './options';
-import typescriptOutputToRollupTransformation from './outputToRollupTransformation';
-import { TSLIB_ID } from './tslib';
+import createModuleResolver from './moduleResolution';
+import getPluginOptions from './options/plugin';
+import { emitParsedOptionsErrors, parseTypescriptConfig } from './options/tsconfig';
+import { validatePaths, validateSourceMap } from './options/validate';
+import findTypescriptOutput from './outputFile';
+import createWatchProgram from './watchProgram';
 
 export default function typescript(options: RollupTypescriptOptions = {}): Plugin {
   const { filter, tsconfig, compilerOptions, tslib, typescript: ts } = getPluginOptions(options);
+  const emittedFiles = new Map<string, string>();
+  const declarationFiles = new Set<string>();
 
   const parsedOptions = parseTypescriptConfig(ts, tsconfig, compilerOptions);
+  parsedOptions.fileNames = parsedOptions.fileNames.filter(filter);
+
   const formatHost = createFormattingHost(ts, parsedOptions.options);
-  const host = createHost(ts, parsedOptions);
-  const services = ts.createLanguageService(host, getDocumentRegistry(ts, process.cwd()));
+  const resolveModule = createModuleResolver(ts, formatHost);
+
+  let program: import('typescript').Watch<unknown> | null = null;
+
+  function normalizePath(fileName: string) {
+    return fileName.split(path.win32.sep).join(path.posix.sep);
+  }
 
   return {
     name: 'typescript',
 
     buildStart() {
       emitParsedOptionsErrors(ts, this, parsedOptions);
+
+      program = createWatchProgram(ts, this, {
+        formatHost,
+        resolveModule,
+        parsedOptions,
+        writeFile(fileName, data) {
+          emittedFiles.set(fileName, data);
+        }
+      });
+    },
+
+    buildEnd() {
+      if (process.env.ROLLUP_WATCH !== 'true') {
+        // ESLint doesn't understand optional chaining
+        // eslint-disable-next-line
+        program?.close();
+      }
+    },
+
+    renderStart(outputOptions) {
+      validateSourceMap(this, parsedOptions.options, outputOptions, parsedOptions.autoSetSourceMap);
+      validatePaths(ts, this, parsedOptions.options, outputOptions);
     },
 
     resolveId(importee, importer) {
       if (importee === 'tslib') {
-        return TSLIB_ID;
+        return tslib;
       }
 
       if (!importer) return null;
 
       // Convert path from windows separators to posix separators
-      const containingFile = importer.split(path.win32.sep).join(path.posix.sep);
+      const containingFile = normalizePath(importer);
 
-      const resolved = host.resolveModuleNames([importee], containingFile);
-      const resolvedFile = resolved[0]?.resolvedFileName;
+      const resolved = resolveModule(importee, containingFile);
 
-      if (resolvedFile) {
-        if (resolvedFile.endsWith('.d.ts')) return null;
-        return resolvedFile;
+      if (resolved) {
+        if (resolved.extension === '.d.ts') return null;
+        return resolved.resolvedFileName;
       }
 
       return null;
     },
 
     load(id) {
-      if (id === TSLIB_ID) {
-        return tslib;
-      }
-      return null;
-    },
-
-    transform(code, id) {
       if (!filter(id)) return null;
 
-      host.addFile(id, code);
-      const output = services.getEmitOutput(id);
+      const output = findTypescriptOutput(ts, parsedOptions, id, emittedFiles);
+      output.declarations.forEach((declaration) => declarationFiles.add(declaration));
 
-      if (output.emitSkipped) {
-        // Emit failed, print all diagnostics for this file
-        const allDiagnostics = ([] as import('typescript').Diagnostic[])
-          .concat(services.getSyntacticDiagnostics(id))
-          .concat(services.getSemanticDiagnostics(id));
-        emitDiagnostics(ts, this, formatHost, allDiagnostics);
+      return output.code ? (output as SourceDescription) : null;
+    },
 
-        throw new Error(`Couldn't compile ${id}`);
+    generateBundle(outputOptions) {
+      for (const id of declarationFiles) {
+        const code = emittedFiles.get(id);
+        if (code) {
+          this.emitFile({
+            type: 'asset',
+            fileName: normalizePath(path.relative(outputOptions.dir!, id)),
+            source: code
+          });
+        }
       }
 
-      return typescriptOutputToRollupTransformation(output.outputFiles);
-    },
-
-    generateBundle() {
-      const program = services.getProgram();
-      if (program == null) return;
-      emitDiagnostics(ts, this, formatHost, ts.getPreEmitDiagnostics(program));
+      const tsBuildInfoPath = ts.getTsBuildInfoEmitOutputFilePath(parsedOptions.options);
+      if (tsBuildInfoPath) {
+        this.emitFile({
+          type: 'asset',
+          fileName: normalizePath(path.relative(outputOptions.dir!, tsBuildInfoPath)),
+          source: emittedFiles.get(tsBuildInfoPath)
+        });
+      }
     }
   };
 }