feat: optimize tsconfig.json loading (#660)

* feat: add option to override tsconfig

* fix: resolve tsconfig

* tweaks

Co-authored-by: EGOIST <0x142857@gmail.com>

src/index.ts

@@ -1,7 +1,6 @@
 import path from 'path'
 import fs from 'fs'
 import { Worker } from 'worker_threads'
-import type { Buildable, MarkRequired } from 'ts-essentials'
 import { removeFiles, debouncePromise, slash, MaybePromise } from './utils'
 import { loadTsupConfig } from './load'
 import glob from 'globby'
@@ -53,7 +52,7 @@ const normalizeOptions = async (
     ...optionsFromConfigFile,
     ...optionsOverride,
   }
-  const options: Buildable<NormalizedOptions> = {
+  const options: Partial<NormalizedOptions> = {
     target: 'node14',
     outDir: 'dist',
     ..._options,
@@ -108,6 +107,12 @@ const normalizeOptions = async (
     options.tsconfigResolvePaths = tsconfig.data?.compilerOptions?.paths || {}
     options.tsconfigDecoratorMetadata =
       tsconfig.data?.compilerOptions?.emitDecoratorMetadata
+    if (options.dts) {
+      options.dts.compilerOptions = {
+        ...(tsconfig.data.compilerOptions || {}),
+        ...(options.dts.compilerOptions || {}),
+      }
+    }
   } else if (options.tsconfig) {
     throw new PrettyError(`Cannot find tsconfig: ${options.tsconfig}`)
   }

src/options.ts

@@ -29,6 +29,11 @@ export type DtsConfig = {
   banner?: string
   /** Insert at the bottom */
   footer?: string
+  /**
+   * Overrides `compilerOptions`
+   * This option takes higher priority than `compilerOptions` in tsconfig.json
+   */
+  compilerOptions?: any
 }
 
 export type BannerOrFooter =

src/rollup.ts

@@ -15,11 +15,10 @@ import resolveFrom from 'resolve-from'
 
 const logger = createLogger()
 
-const loadCompilerOptions = (tsconfig?: string) => {
-  if (!tsconfig) return {}
-  const configFile = ts.readConfigFile(tsconfig, ts.sys.readFile)
+const parseCompilerOptions = (compilerOptions?: any) => {
+  if (!compilerOptions) return {}
   const { options } = ts.parseJsonConfigFileContent(
-    configFile.config,
+    { compilerOptions },
     ts.sys,
     './'
   )
@@ -83,7 +82,7 @@ const getRollupConfig = async (
 ): Promise<RollupConfig> => {
   setSilent(options.silent)
 
-  const compilerOptions = loadCompilerOptions(options.tsconfig)
+  const compilerOptions = parseCompilerOptions(options.dts?.compilerOptions)
 
   const dtsOptions = options.dts || {}
   dtsOptions.entry = dtsOptions.entry || options.entry