/// <reference no-default-lib="true"/> This directive marks a file as a default library. You will see this comment at the top of lib.d.ts and its different variants. This directive instructs the compiler to not include the default library (i.e. lib.d.ts) in the compilation. The impact here is similar to passing --noLib on the command line. Also note that when passing --skipDefaultLibCheck, the compiler will only skip checking files with /// <reference no-default-lib="true"/>.

/// <amd-module /> By default AMD modules are generated anonymous. This can lead to problems when other tools are used to process the resulting modules, such as bundlers (e.g. r.js). The amd-module directive allows passing an optional module name to the compiler: amdModule.ts ///<amd-module name="NamedModule"/> export class C { } Will result in assigning the name NamedModule to the module as part of calling the AMD define: amdModule.js define("NamedModule", ["require", "exports"],

/// <amd-dependency /> Note: this directive has been deprecated. Use import "moduleName"; statements instead. /// <amd-dependency path="x" /> informs the compiler about a non-TS module dependency that needs to be injected in the resulting module’s require call. The amd-dependency directive can also have an optional name property; this allows passing an optional name for an amd-dependency: /// <amd-dependency path="legacy/moduleA" name="moduleA"/> declare var moduleA:MyType

/// <reference path="..." /> The /// <reference path="..." /> directive is the most common of this group. It serves as a declaration of dependency between files. Triple-slash references instruct the compiler to include additional files in the compilation process. They also serve as a method to order the output when using --out or --outFile. Files are emitted to the output file location in the same order as the input after preprocessing pass.