mirror of
https://github.com/denoland/deno
synced 2024-10-30 02:21:11 +00:00
107 lines
4 KiB
TypeScript
107 lines
4 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { SYSTEM_LOADER } from "./compiler_bootstrap.ts";
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import {
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commonPath,
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normalizeString,
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CHAR_FORWARD_SLASH
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} from "./compiler_util.ts";
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import { assert } from "./util.ts";
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/** Local state of what the root exports are of a root module. */
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let rootExports: string[] | undefined;
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/** Take a URL and normalize it, resolving relative path parts. */
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function normalizeUrl(rootName: string): string {
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const match = /^(\S+:\/{2,3})(.+)$/.exec(rootName);
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if (match) {
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const [, protocol, path] = match;
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return `${protocol}${normalizeString(
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path,
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false,
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"/",
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code => code === CHAR_FORWARD_SLASH
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)}`;
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} else {
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return rootName;
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}
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}
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/** Given a root name, contents, and source files, enrich the data of the
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* bundle with a loader and re-export the exports of the root name. */
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export function buildBundle(
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rootName: string,
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data: string,
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sourceFiles: readonly ts.SourceFile[]
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): string {
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// when outputting to AMD and a single outfile, TypeScript makes up the module
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// specifiers which are used to define the modules, and doesn't expose them
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// publicly, so we have to try to replicate
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const sources = sourceFiles.map(sf => sf.fileName);
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const sharedPath = commonPath(sources);
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rootName = normalizeUrl(rootName)
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.replace(sharedPath, "")
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.replace(/\.\w+$/i, "");
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// If one of the modules requires support for top-level-await, TypeScript will
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// emit the execute function as an async function. When this is the case we
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// need to bubble up the TLA to the instantiation, otherwise we instantiate
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// synchronously.
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const hasTla = data.match(/execute:\sasync\sfunction\s/);
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let instantiate: string;
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if (rootExports && rootExports.length) {
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instantiate = hasTla
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? `const __exp = await __instantiateAsync("${rootName}");\n`
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: `const __exp = __instantiate("${rootName}");\n`;
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for (const rootExport of rootExports) {
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if (rootExport === "default") {
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instantiate += `export default __exp["${rootExport}"];\n`;
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} else {
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instantiate += `export const ${rootExport} = __exp["${rootExport}"];\n`;
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}
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}
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} else {
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instantiate = hasTla
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? `await __instantiateAsync("${rootName}");\n`
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: `__instantiate("${rootName}");\n`;
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}
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return `${SYSTEM_LOADER}\n${data}\n${instantiate}`;
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}
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/** Set the rootExports which will by the `emitBundle()` */
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export function setRootExports(program: ts.Program, rootModule: string): void {
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// get a reference to the type checker, this will let us find symbols from
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// the AST.
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const checker = program.getTypeChecker();
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// get a reference to the main source file for the bundle
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const mainSourceFile = program.getSourceFile(rootModule);
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assert(mainSourceFile);
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// retrieve the internal TypeScript symbol for this AST node
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const mainSymbol = checker.getSymbolAtLocation(mainSourceFile);
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if (!mainSymbol) {
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return;
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}
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rootExports = checker
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.getExportsOfModule(mainSymbol)
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// .getExportsOfModule includes type only symbols which are exported from
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// the module, so we need to try to filter those out. While not critical
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// someone looking at the bundle would think there is runtime code behind
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// that when there isn't. There appears to be no clean way of figuring that
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// out, so inspecting SymbolFlags that might be present that are type only
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.filter(
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sym =>
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sym.flags & ts.SymbolFlags.Class ||
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!(
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sym.flags & ts.SymbolFlags.Interface ||
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sym.flags & ts.SymbolFlags.TypeLiteral ||
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sym.flags & ts.SymbolFlags.Signature ||
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sym.flags & ts.SymbolFlags.TypeParameter ||
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sym.flags & ts.SymbolFlags.TypeAlias ||
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sym.flags & ts.SymbolFlags.Type ||
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sym.flags & ts.SymbolFlags.Namespace ||
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sym.flags & ts.SymbolFlags.InterfaceExcludes ||
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sym.flags & ts.SymbolFlags.TypeParameterExcludes ||
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sym.flags & ts.SymbolFlags.TypeAliasExcludes
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)
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)
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.map(sym => sym.getName());
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}
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