Merge pull request #1644 from davidpcaldwell/refine-wf-project-typesc…

…ript-versioning-code

Refine code that determines TypeScript version for wf project and doc…

tools/wf/typescript.fifty.ts

@@ -64,7 +64,12 @@ namespace slime.jsh.wf.internal.module {
 
 		export namespace project {
 			export interface Typescript {
+				/**
+				 * Returns the TypeScript version that should be used when processing this project. Defaults to the project version
+				 * indicated in `tsc.version`, if any; falls back to the default TypeScript version declared by SLIME.
+				 */
 				version: (project: slime.jsh.wf.Project) => string
+
 				configurationFile: (project: slime.jsh.wf.Project) => slime.$api.fp.Maybe<slime.jrunscript.file.Location>
 			}
 		}

tools/wf/typescript.js

@@ -65,8 +65,10 @@
 		/** @type { slime.jsh.wf.internal.typescript.Exports["Project"]["version"] } */
 		var Project_getTypescriptVersion = $api.fp.pipe(
 			base,
-			$context.library.file.Location.directory.relativePath("tsc.version"),
-			$api.fp.world.mapping($context.library.file.world.Location.file.read.string.world()),
+			$api.fp.pipe(
+				$context.library.file.Location.directory.relativePath("tsc.version"),
+				$context.library.file.Location.file.read.string.maybe
+			),
 			$api.fp.Maybe.else(version)
 		);