Fix TypeScript parameter decorators on class constructors (#734)

This release fixes a TypeScript translation bug where parameter decorators on class constructors were translated incorrectly. Affected code looks like this:

This bug has been fixed. In addition, decorators are no longer allowed on class constructors themselves because they are not allowed in TypeScript.

Resolve browser entries in package.json with no file extension (#740)

This fix changes how esbuild interprets the browser field in package.json. It will now remap imports without a file extension to browser map entries without a file extension, which improves compatibility with Webpack. Specifically, a package.json file with "browser": {"./file": "./something.js"} will now match an import of ./file. Previously the package.json file had to contain something like "browser": {"./file.js": "./something.js"} instead. Note that for compatibility with the rest of the ecosystem, a remapping of ./file will counter-intuitively not match an import of ./file.js even though it works fine in the other direction.

Warning: npm v7 bug may prevent esbuild installation

This is a warning for people reading these release notes, not a code change. I have discovered a bug in npm v7 where your package-lock.json file can become corrupted such that no postinstall scripts are run. This bug affects all packages with postinstall scripts, not just esbuild, and happens when running npm v7 on a package-lock.json file from npm v6 or earlier. It seems like deleting and regenerating your package-lock.json file is a valid workaround that should get esbuild working again.