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type * as ts from 'typescript';\nimport type * as swcWasm from '@swc/wasm';\nimport type * as swcTypes from '@swc/core';\nimport type { CreateTranspilerOptions, Transpiler } from './types';\nimport type { NodeModuleEmitKind } from '..';\n\ntype SwcInstance = typeof swcWasm;\nexport interface SwcTranspilerOptions extends CreateTranspilerOptions {\n /**\n * swc compiler to use for compilation\n * Set to '@swc/wasm' to use swc's WASM compiler\n * Default: '@swc/core', falling back to '@swc/wasm'\n */\n swc?: string | typeof swcWasm;\n}\n\nexport function create(createOptions: SwcTranspilerOptions): Transpiler {\n const {\n swc,\n service: { config, projectLocalResolveHelper },\n transpilerConfigLocalResolveHelper,\n nodeModuleEmitKind,\n } = createOptions;\n\n // Load swc compiler\n let swcInstance: SwcInstance;\n // Used later in diagnostics; merely needs to be human-readable.\n let swcDepName: string = 'swc';\n if (typeof swc === 'string') {\n swcDepName = swc;\n swcInstance = require(transpilerConfigLocalResolveHelper(\n swc,\n true\n )) as typeof swcWasm;\n } else if (swc == null) {\n let swcResolved;\n try {\n swcDepName = '@swc/core';\n swcResolved = transpilerConfigLocalResolveHelper(swcDepName, true);\n } catch (e) {\n try {\n swcDepName = '@swc/wasm';\n swcResolved = transpilerConfigLocalResolveHelper(swcDepName, true);\n } catch (e) {\n throw new Error(\n 'swc compiler requires either @swc/core or @swc/wasm to be installed as a dependency. See https://typestrong.org/ts-node/docs/transpilers'\n );\n }\n }\n swcInstance = require(swcResolved) as typeof swcWasm;\n } else {\n swcInstance = swc;\n }\n\n // Prepare SWC options derived from typescript compiler options\n const { nonTsxOptions, tsxOptions } = createSwcOptions(\n config.options,\n nodeModuleEmitKind,\n swcInstance,\n swcDepName\n );\n\n const transpile: Transpiler['transpile'] = (input, transpileOptions) => {\n const { fileName } = transpileOptions;\n const swcOptions =\n fileName.endsWith('.tsx') || fileName.endsWith('.jsx')\n ? tsxOptions\n : nonTsxOptions;\n const { code, map } = swcInstance.transformSync(input, {\n ...swcOptions,\n filename: fileName,\n });\n return { outputText: code, sourceMapText: map };\n };\n\n return {\n transpile,\n };\n}\n\n/** @internal */\nexport const targetMapping = new Map<ts.ScriptTarget, SwcTarget>();\ntargetMapping.set(/* ts.ScriptTarget.ES3 */ 0, 'es3');\ntargetMapping.set(/* ts.ScriptTarget.ES5 */ 1, 'es5');\ntargetMapping.set(/* ts.ScriptTarget.ES2015 */ 2, 'es2015');\ntargetMapping.set(/* ts.ScriptTarget.ES2016 */ 3, 'es2016');\ntargetMapping.set(/* ts.ScriptTarget.ES2017 */ 4, 'es2017');\ntargetMapping.set(/* ts.ScriptTarget.ES2018 */ 5, 'es2018');\ntargetMapping.set(/* ts.ScriptTarget.ES2019 */ 6, 'es2019');\ntargetMapping.set(/* ts.ScriptTarget.ES2020 */ 7, 'es2020');\ntargetMapping.set(/* ts.ScriptTarget.ES2021 */ 8, 'es2021');\ntargetMapping.set(/* ts.ScriptTarget.ES2022 */ 9, 'es2022');\ntargetMapping.set(/* ts.ScriptTarget.ESNext */ 99, 'es2022');\n\ntype SwcTarget = typeof swcTargets[number];\n/**\n * @internal\n * We use this list to downgrade to a prior target when we probe swc to detect if it supports a particular target\n */\nconst swcTargets = [\n 'es3',\n 'es5',\n 'es2015',\n 'es2016',\n 'es2017',\n 'es2018',\n 'es2019',\n 'es2020',\n 'es2021',\n 'es2022',\n] as const;\n\nconst ModuleKind = {\n None: 0,\n CommonJS: 1,\n AMD: 2,\n UMD: 3,\n System: 4,\n ES2015: 5,\n ES2020: 6,\n ESNext: 99,\n Node16: 100,\n NodeNext: 199,\n} as const;\n\nconst JsxEmit = {\n ReactJSX: /* ts.JsxEmit.ReactJSX */ 4,\n ReactJSXDev: /* ts.JsxEmit.ReactJSXDev */ 5,\n} as const;\n\n/**\n * Prepare SWC options derived from typescript compiler options.\n * @internal exported for testing\n */\nexport function createSwcOptions(\n compilerOptions: ts.CompilerOptions,\n nodeModuleEmitKind: NodeModuleEmitKind | undefined,\n swcInstance: SwcInstance,\n swcDepName: string\n) {\n const {\n esModuleInterop,\n sourceMap,\n importHelpers,\n experimentalDecorators,\n emitDecoratorMetadata,\n target,\n module,\n jsx,\n jsxFactory,\n jsxFragmentFactory,\n strict,\n alwaysStrict,\n noImplicitUseStrict,\n } = compilerOptions;\n\n let swcTarget = targetMapping.get(target!) ?? 'es3';\n // Downgrade to lower target if swc does not support the selected target.\n // Perhaps project has an older version of swc.\n // TODO cache the results of this; slightly faster\n let swcTargetIndex = swcTargets.indexOf(swcTarget);\n for (; swcTargetIndex >= 0; swcTargetIndex--) {\n try {\n swcInstance.transformSync('', {\n jsc: { target: swcTargets[swcTargetIndex] },\n });\n break;\n } catch (e) {}\n }\n swcTarget = swcTargets[swcTargetIndex];\n const keepClassNames = target! >= /* ts.ScriptTarget.ES2016 */ 3;\n const isNodeModuleKind =\n module === ModuleKind.Node16 || module === ModuleKind.NodeNext;\n // swc only supports these 4x module options [MUST_UPDATE_FOR_NEW_MODULEKIND]\n const moduleType =\n module === ModuleKind.CommonJS\n ? 'commonjs'\n : module === ModuleKind.AMD\n ? 'amd'\n : module === ModuleKind.UMD\n ? 'umd'\n : isNodeModuleKind && nodeModuleEmitKind === 'nodecjs'\n ? 'commonjs'\n : isNodeModuleKind && nodeModuleEmitKind === 'nodeesm'\n ? 'es6'\n : 'es6';\n // In swc:\n // strictMode means `\"use strict\"` is *always* emitted for non-ES module, *never* for ES module where it is assumed it can be omitted.\n // (this assumption is invalid, but that's the way swc behaves)\n // tsc is a bit more complex:\n // alwaysStrict will force emitting it always unless `import`/`export` syntax is emitted which implies it per the JS spec.\n // if not alwaysStrict, will emit implicitly whenever module target is non-ES *and* transformed module syntax is emitted.\n // For node, best option is to assume that all scripts are modules (commonjs or esm) and thus should get tsc's implicit strict behavior.\n\n // Always set strictMode, *unless* alwaysStrict is disabled and noImplicitUseStrict is enabled\n const strictMode =\n // if `alwaysStrict` is disabled, remembering that `strict` defaults `alwaysStrict` to true\n (alwaysStrict === false || (alwaysStrict !== true && strict !== true)) &&\n // if noImplicitUseStrict is enabled\n noImplicitUseStrict === true\n ? false\n : true;\n\n const jsxRuntime: swcTypes.ReactConfig['runtime'] =\n jsx === JsxEmit.ReactJSX || jsx === JsxEmit.ReactJSXDev\n ? 'automatic'\n : undefined;\n const jsxDevelopment: swcTypes.ReactConfig['development'] =\n jsx === JsxEmit.ReactJSXDev ? true : undefined;\n\n const nonTsxOptions = createVariant(false);\n const tsxOptions = createVariant(true);\n return { nonTsxOptions, tsxOptions };\n\n function createVariant(isTsx: boolean): swcTypes.Options {\n const swcOptions: swcTypes.Options = {\n sourceMaps: sourceMap,\n // isModule: true,\n module: moduleType\n ? ({\n noInterop: !esModuleInterop,\n type: moduleType,\n strictMode,\n // For NodeNext and Node12, emit as CJS but do not transform dynamic imports\n ignoreDynamic: nodeModuleEmitKind === 'nodecjs',\n } as swcTypes.ModuleConfig)\n : undefined,\n swcrc: false,\n jsc: {\n externalHelpers: importHelpers,\n parser: {\n syntax: 'typescript',\n tsx: isTsx,\n decorators: experimentalDecorators,\n dynamicImport: true,\n importAssertions: true,\n },\n target: swcTarget,\n transform: {\n decoratorMetadata: emitDecoratorMetadata,\n legacyDecorator: true,\n react: {\n throwIfNamespace: false,\n development: jsxDevelopment,\n useBuiltins: false,\n pragma: jsxFactory!,\n pragmaFrag: jsxFragmentFactory!,\n runtime: jsxRuntime,\n } as swcTypes.ReactConfig,\n },\n keepClassNames,\n experimental: {\n keepImportAssertions: true,\n },\n } as swcTypes.JscConfig,\n };\n\n // Throw a helpful error if swc version is old, for example, if it rejects `ignoreDynamic`\n try {\n swcInstance.transformSync('', swcOptions);\n } catch (e) {\n throw new Error(\n `${swcDepName} threw an error when attempting to validate swc compiler options.\\n` +\n 'You may be using an old version of swc which does not support the options used by ts-node.\\n' +\n 'Try upgrading to the latest version of swc.\\n' +\n 'Error message from swc:\\n' +\n (e as Error)?.message\n );\n }\n\n return swcOptions;\n }\n}\n"]} |