Custom TypeScript Types (#3835)

This PR adds better TypeScript types into Slate and is based on the proposal here: https://github.com/ianstormtaylor/slate/issues/3725

* Extend Slate's types like Element and Text

* Supports type discrimination (ie. if an element has type === "table" then we get a reduced set of properties)

* added custom types

* files

* more extensions

* files

* changed fixtures

* changes eslint file

* changed element.children to descendant

* updated types

* more type changes

* changed a lot of typing, still getting building errors

* extended text type in slate-react

* removed type assertions

* Clean up of custom types and a couple uneeded comments.

* Rename headingElement-true.tsx.tsx to headingElement-true.tsx

* moved basetext and baselement

* Update packages/slate/src/interfaces/text.ts

Co-authored-by: Brent Farese <25846953+BrentFarese@users.noreply.github.com>

* Fix some type issues with core functions.

* Clean up text and element files.

* Convert other types to extended types.

* Change the type of editor.marks to the appropriate type.

* Add version 100.0.0 to package.json

* Revert "Add version 100.0.0 to package.json"

This reverts commit 329e44e43d.

* added custom types

* files

* more extensions

* files

* changed fixtures

* changes eslint file

* changed element.children to descendant

* updated types

* more type changes

* changed a lot of typing, still getting building errors

* extended text type in slate-react

* removed type assertions

* Clean up of custom types and a couple uneeded comments.

* Rename headingElement-true.tsx.tsx to headingElement-true.tsx

* moved basetext and baselement

* Update packages/slate/src/interfaces/text.ts

Co-authored-by: Brent Farese <25846953+BrentFarese@users.noreply.github.com>

* Fix some type issues with core functions.

* Clean up text and element files.

* Convert other types to extended types.

* Change the type of editor.marks to the appropriate type.

* Run linter.

* Remove key:string uknown from the base types.

* Clean up types after removing key:string unknown.

* Lint and prettier fixes.

* Implement custom-types

Co-authored-by: mdmjg <mdj308@nyu.edu>

* added custom types to examples

* reset yarn lock

* added ts to fixtures

* examples custom types

* Working fix

* ts-thesunny-try

* Extract interface types.

* Fix minor return type in create-editor.

* Fix the typing issue with Location having compile time CustomTypes

* Extract types for Transforms.

* Update README.

* Fix dependency on slate-history in slate-react

Co-authored-by: mdmjg <mdj308@nyu.edu>
Co-authored-by: Brent Farese <brentfarese@gmail.com>
Co-authored-by: Brent Farese <25846953+BrentFarese@users.noreply.github.com>
Co-authored-by: Tim Buckley <timothypbuckley@gmail.com>

support/fixtures.js

@@ -25,7 +25,11 @@ export const fixtures = (...args) => {
       }
       if (
         stat.isFile() &&
-        (file.endsWith('.js') || file.endsWith('.ts') || file.endsWith('.tsx')) &&
+        (file.endsWith('.js') ||
+          file.endsWith('.tsx') ||
+          file.endsWith('.ts')) &&
+        !file.endsWith('custom-types.ts') &&
+        !file.endsWith('type-guards.ts') &&
         !file.startsWith('.') &&
         // Ignoring `index.js` files allows us to use the fixtures directly
         // from the top-level directory itself, instead of only children.
@@ -34,7 +38,7 @@ export const fixtures = (...args) => {
         const name = basename(file, extname(file))
 
         // This needs to be a non-arrow function to use `this.skip()`.
-        it(`${name} `, function () {
+        it(`${name} `, function() {
           const module = require(p)
 
           if (module.skip) {