build: use import map for ts imports

simplifies version management.
see: https://docs.deno.com/runtime/manual/basics/import_maps

deno.jsonc

@@ -11,5 +11,6 @@
     "include": ["scripts", "doc", "*.md"],
     "semiColons": false,
     "lineWidth": 100
-  }
+  },
+  "importMap": "import_map.json"
 }

import_map.json

@@ -0,0 +1,15 @@
+{
+  "imports": {
+    "$std/": "https://deno.land/[email protected]/",
+    "$asynciter/": "https://deno.land/x/[email protected]/",
+    "$zod/": "https://deno.land/x/[email protected]/",
+    "$catjazz/": "https://deno.land/x/[email protected]/",
+    "$ts-reset/": "https://raw.githubusercontent.com/total-typescript/ts-reset/b2df073b6b0fcb9f9599408d88cf559344c10586/src/",
+    "$outdent/": "https://deno.land/x/[email protected]/"
+  },
+  "scopes": {
+    "$ts-reset/": {
+      "utils.d.ts": "https://raw.githubusercontent.com/total-typescript/ts-reset/b2df073b6b0fcb9f9599408d88cf559344c10586/src/entrypoints/utils.d.ts"
+    }
+  }
+}

scripts/front_matter.ts

@@ -2,9 +2,9 @@
  * Converts first heading into frontmatter.
  */
 
-import * as frontmatter from "https://deno.land/std@0.201.0/front_matter/yaml.ts"
-import { walk } from "https://deno.land/std@0.201.0/fs/walk.ts"
-import { asynciter } from "https://deno.land/x/asynciter@0.0.18/mod.ts"
+import * as frontmatter from "$std/front_matter/yaml.ts"
+import { walk } from "$std/fs/walk.ts"
+import { asynciter } from "$asynciter/mod.ts"
 
 export const consumeFirstHeading = (lines: string[]): { heading: string; lines: string[] } => {
   // consume all empty lines with regex

scripts/front_matter_test.ts

@@ -1,4 +1,4 @@
-import { assertEquals } from "https://deno.land/std@0.201.0/assert/assert_equals.ts"
+import { assertEquals } from "$std/assert/assert_equals.ts"
 import { consumeFirstHeading, toFrontmatter } from "./front_matter.ts"
 
 const input = /*md*/ `

scripts/gen_cli_docs.ts

@@ -3,7 +3,7 @@
 /**
  * Generates markdown documentation for the game executable.
  */
-import { chunk } from "https://deno.land/std@0.201.0/collections/chunk.ts"
+import { chunk } from "$std/collections/chunk.ts"
 
 export type Flag = { option: string; desc: string }
 export type Section = { title: string; flags: Flag[] }