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tsconfig.ts

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import * as path from "path";

import * as ts from "typescript";

import { CompilerOptions, TypeScriptToLuaOptions } from "../CompilerOptions";

import { normalizeSlashes } from "../utils";

import * as cliDiagnostics from "./diagnostics";

import { ParsedCommandLine, updateParsedConfigFile } from "./parse";

export function locateConfigFile(commandLine: ParsedCommandLine): ts.Diagnostic | string | undefined {

const { project } = commandLine.options;

if (!project) {

if (commandLine.fileNames.length > 0) {

return undefined;

}

const searchPath = normalizeSlashes(process.cwd());

return ts.findConfigFile(searchPath, ts.sys.fileExists);

}

if (commandLine.fileNames.length !== 0) {

return cliDiagnostics.optionProjectCannotBeMixedWithSourceFilesOnACommandLine();

}

// TODO: Unlike tsc, this resolves `.` to absolute path

const fileOrDirectory = normalizeSlashes(path.resolve(process.cwd(), project));

if (ts.sys.directoryExists(fileOrDirectory)) {

const configFileName = path.posix.join(fileOrDirectory, "tsconfig.json");

if (ts.sys.fileExists(configFileName)) {

return configFileName;

} else {

return cliDiagnostics.cannotFindATsconfigJsonAtTheSpecifiedDirectory(project);

}

} else if (ts.sys.fileExists(fileOrDirectory)) {

return fileOrDirectory;

} else {

return cliDiagnostics.theSpecifiedPathDoesNotExist(project);

}

}

export function parseConfigFileWithSystem(

configFileName: string,

commandLineOptions?: CompilerOptions,

system = ts.sys

): ParsedCommandLine {

const configRootDir = path.dirname(configFileName);

const parsedConfigFile = ts.parseJsonSourceFileConfigFileContent(

ts.readJsonConfigFile(configFileName, system.readFile),

system,

configRootDir,

commandLineOptions,

configFileName

);

const cycleCache = new Set<string>();

const extendedTstlOptions = getExtendedTstlOptions(configFileName, configRootDir, cycleCache, system);

parsedConfigFile.raw.tstl = Object.assign(extendedTstlOptions, parsedConfigFile.raw.tstl ?? {});

return updateParsedConfigFile(parsedConfigFile);

}

function resolveNpmModuleConfig(

moduleName: string,

configRootDir: string,

host: ts.ModuleResolutionHost

): string | undefined {

const resolved = ts.nodeNextJsonConfigResolver(moduleName, path.join(configRootDir, "tsconfig.json"), host);

if (resolved.resolvedModule) {

return resolved.resolvedModule.resolvedFileName;

}

}

function getExtendedTstlOptions(

configFilePath: string,

configRootDir: string,

cycleCache: Set<string>,

system: ts.System

): TypeScriptToLuaOptions {

const absolutePath = ts.pathIsAbsolute(configFilePath)

? configFilePath

: ts.pathIsRelative(configFilePath)

? path.resolve(configRootDir, configFilePath)

: resolveNpmModuleConfig(configFilePath, configRootDir, system); // if a path is neither relative nor absolute, it is probably a npm module

if (!absolutePath) {

return {};

}

const newConfigRoot = path.dirname(absolutePath);

if (cycleCache.has(absolutePath)) {

return {};

}

cycleCache.add(absolutePath);

const fileContent = system.readFile(absolutePath);

const options = {};

if (fileContent) {

const { config: parsedConfig } = ts.parseConfigFileTextToJson(configFilePath, fileContent) as {

config?: {

extends?: string | string[];

tstl?: TypeScriptToLuaOptions;

};

};

if (!parsedConfig) {

return {};

}

if (parsedConfig.extends) {

if (Array.isArray(parsedConfig.extends)) {

for (const extendedConfigFile of parsedConfig.extends) {

Object.assign(

options,

getExtendedTstlOptions(extendedConfigFile, newConfigRoot, cycleCache, system)

);

}

} else {

Object.assign(options, getExtendedTstlOptions(parsedConfig.extends, newConfigRoot, cycleCache, system));

}

}

if (parsedConfig.tstl) {

Object.assign(options, parsedConfig.tstl);

}

}

return options;

}

export function createConfigFileUpdater(

optionsToExtend: CompilerOptions

): (options: ts.CompilerOptions) => ts.Diagnostic[] {

const configFileMap = new WeakMap<ts.TsConfigSourceFile, ts.ParsedCommandLine>();

return options => {

const { configFile, configFilePath } = options;

if (!configFile || !configFilePath) return [];

if (!configFileMap.has(configFile)) {

const parsedConfigFile = parseConfigFileWithSystem(configFilePath, optionsToExtend, ts.sys);

configFileMap.set(configFile, parsedConfigFile);

}

const parsedConfigFile = configFileMap.get(configFile)!;

Object.assign(options, parsedConfigFile.options);

return parsedConfigFile.errors;

};

}