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`SEMMLE_TYPESCRIPT_NODE_RUNTIME` can be used to provide the path to the Node.js runtime executable. If this is omitted, the extractor defaults to the current behaviour of looking for `node` on the PATH. `SEMMLE_TYPESCRIPT_NODE_RUNTIME_EXTRA_ARGS` can be used to provide additional arguments to the Node.js runtime. These are passed first, before the arguments supplied by the extractor. These changes are designed to allow TypeScript extraction in controlled customer environments where we cannot control the PATH, or must use custom Node.js executables with certain arguments set.
JavaScript extractor
This directory contains the source code of the JavaScript extractor. The extractor depends on various libraries that are not currently bundled with the source code, so at present it cannot be built in isolation.
The extractor consists of a parser for the latest version of ECMAScript, including a few proposed and historic extensions (see src/com/semmle/jcorn), classes for representing JavaScript and TypeScript ASTs (src/com/semmle/js/ast and src/com/semmle/ts/ast), and various other bits of functionality. Historically, the main entry point of the JavaScript extractor has been com.semmle.js.extractor.Main. However, this class is slowly being phased out in favour of com.semmle.js.extractor.AutoBuild, which is the entry point used by LGTM.
License
Like the LGTM queries, the JavaScript extractor is licensed under Apache License 2.0 by Semmle.