JavaScript: Move extractor change notes.

Max Schaefer · Max Schaefer · commit 52e5879a2d44 · 2018-11-07T07:48:25.000Z
diff --git a/change-notes/1.19/extractor-javascript.md b/change-notes/1.19/extractor-javascript.md
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+[[ condition: enterprise-only ]]
+
+# Improvements to JavaScript analysis
+
+> NOTES
+>
+> Please describe your changes in terms that are suitable for
+> customers to read. These notes will have only minor tidying up
+> before they are published as part of the release notes.
+>
+> This file is written for lgtm users and should contain *only*
+> notes about changes that affect lgtm enterprise users. Add
+> any other customer-facing changes to the `studio-java.md`
+> file.
+>
+
+## General improvements
+
+> Changes that affect alerts in many files or from many queries
+> For example, changes to file classification
+
+## Changes to code extraction
+
+* Destructuring assignments are now modeled more precisely, which fixes both false-negative and false-positive results for the rules
+  "Missing variable declaration" and "Useless assignment to local variable" in certain corner cases.
+* The TypeScript compiler is now bundled with the distribution, and no longer needs to be installed manually.
+  Should the compiler version need to be overridden, set the `SEMMLE_TYPESCRIPT_HOME` environment variable to
+  point to an installation of the `typescript` NPM package.
