feat: add initial tsconfig bases

- base, library, and library-build, same as the package exports
  - initially started with library, but if I wanted to use this repo
    for apps as well, I wouldn't want some configurations like
    declarations or declaration maps as they're unused by apps
    - so split off library and base
  - library-build doesn't add much and is for a particular use-case, so
    I also may end up removing that at some point

- NOTE: `extends` resolves relative paths based on the location of the
  _extended_ config file, not the one doing the extension
  - https://www.typescriptlang.org/tsconfig#extends
  - This effectively means that all "path-based compiler options" like
    `outDir`, `outFile`, `rootDir`, `include`, `exclude`, and `files`
    have to be repeated in all tsconfigs
    - c.f. microsoft/TypeScript#29172,
      microsoft/TypeScript#25430
    - so the usage of them here is more of as an "example" of sorts of
      what should be repeated, as installing from NPM would result in
      the paths here being _inside_ `node_modules` (or elsewhere pending
      the NPM client you use)

src/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  // https://github.com/tsconfig/bases
+  "extends": "@tsconfig/strictest/tsconfig.json",
+  // exclude node_modules (the default), dist dir, coverage dir
+  "exclude": ["node_modules/", "dist/", "coverage/"],
+  // see https://www.typescriptlang.org/tsconfig to better understand tsconfigs
+  "compilerOptions": {
+    // output to dist/ dir
+    "outDir": "dist/",
+    // output .js.map sourcemap files for consumers / debugging
+    "sourceMap": true,
+    // use Node's module resolution algorithm, instead of the legacy TS one
+    "moduleResolution": "node",
+    // resolve JSON files
+    "resolveJsonModule": true,
+    // transpile JSX to React.createElement
+    "jsx": "react",
+    // ignored during builds, but commonly used when type-checking with `tsc`
+    "noEmit": true,
+  },
+}

src/tsconfig.library-build.json

@@ -0,0 +1,14 @@
+{
+  // tsconfig.library.json is used for type-checking _all_ files, tsconfig.library-build.json is just used for the build
+  "extends": "./tsconfig.library.json",
+  // allowlist of files to build
+  "files": ["src/index.ts"],
+  "compilerOptions": {
+    // override the base
+    "noEmit": false,
+    // don't output JS files, only declarations (Rollup outputs the JS)
+    "emitDeclarationOnly": true,
+  },
+  // read this file as a tsconfig even though it's named slightly differently
+  "$schema": "https://json.schemastore.org/tsconfig",
+}

src/tsconfig.library.json

@@ -0,0 +1,13 @@
+{
+  // small library-specific additions on top of the base
+  "extends": "./tsconfig.json",
+  // see https://www.typescriptlang.org/tsconfig to better understand tsconfigs
+  "compilerOptions": {
+    // output .d.ts declaration files for consumers
+    "declaration": true,
+    // output .d.ts.map declaration map files for consumers
+    "declarationMap": true,
+  },
+  // read this file as a tsconfig even though it's named slightly differently
+  "$schema": "https://json.schemastore.org/tsconfig",
+}