• Placeholder support for curried functions
• Placeholder support for auto-curried fp functions (fixes placeholder is missing from lodash/fp #24602)
• Support importing "lodash/fp/placehoder" and the alias "lodash/fp/__"

Unfortunately, since this required adding a ridiculous number of new overloads, it caused the tests to run out of memory. To fix the tests, I needed to do the following:

• Removed parameterless generated overloads (e.g. interface LodashPick { (): LodashPick; ... }). I don't see any use case for these overloads (they don't really do anything), so I removed them to free up some space.
• Removed all jsdoc comments from the fp function definitions. This is unfortunate, but it made the biggest difference by far in the performance of the tests.
• Combined FP code into one file. Now all function definitions are inside fp.d.ts, instead of being distributed among hundreds of files. Unfortunately this change makes the diff very hard to read, but it's necessary in order to make the tests pass.

So there are some drawbacks, but I think the value of placeholder support outweighs them all.

Template:

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes: https://github.com/lodash/lodash/wiki/FP-Guide#placeholders
• Increase the version number in the header if appropriate. (N/A)
• If you are making substantial changes, consider adding a tslint.json containing { "extends": "dtslint/dt.json" }.