angular-cn/docs/dgeni-package/services/tsParser.js

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var ts = require('typescript');
var path = require('canonical-path');
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module.exports = function tsParser(createCompilerHost, log) {
return {
// These are the extension that we should consider when trying to load a module
// During migration from Traceur, there is a mix of `.ts`, `.es6` and `.js` (atScript)
// files in the project and the TypeScript compiler only looks for `.ts` files when trying
// to load imports.
extensions: ['.ts', '.js'],
// The options for the TS compiler
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options: {
allowNonTsExtensions: true,
charset: 'utf8'
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},
parse: function(fileNames, baseDir) {
// "Compile" a program from the given module filenames, to get hold of a
// typeChecker that can be used to interrogate the modules, exports and so on.
var host = createCompilerHost(this.options, baseDir, this.extensions);
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var program = ts.createProgram(fileNames, this.options, host);
var typeChecker = program.getTypeChecker();
// Create an array of module symbols for each file we were given
var moduleSymbols = [];
fileNames.forEach(function(fileName) {
var sourceFile = program.getSourceFile(fileName);
if (!sourceFile) {
throw new Error('Invalid source file: ' + fileName);
} else if (!sourceFile.symbol) {
// Some files contain only a comment and no actual module code
log.warn('No module code found in ' + fileName);
} else {
moduleSymbols.push(sourceFile.symbol);
}
});
moduleSymbols.forEach(function(tsModule) {
// The type checker has a nice helper function that returns an array of Symbols
// representing the exports for a given module
tsModule.exportArray = typeChecker.getExportsOfModule(tsModule);
// Although 'star' imports (e.g. `export * from 'some/module';) get resolved automatically
// by the compiler/binder, it seems that explicit imports (e.g. `export {SomeClass} from 'some/module'`)
// do not so we have to do a little work.
tsModule.exportArray.forEach(function(moduleExport) {
if (moduleExport.flags & ts.SymbolFlags.Alias) {
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// To maintain the alias information (particularly the alias name)
// we just attach the original "resolved" symbol to the alias symbol
moduleExport.resolvedSymbol = typeChecker.getAliasedSymbol(moduleExport);
}
});
});
moduleSymbols.typeChecker = typeChecker;
return {
moduleSymbols: moduleSymbols,
typeChecker: typeChecker,
program: program,
host: host
};
}
};
};