[ESM] Convert the "cmaps"-task to use import() syntax

external/cmapscompress/compress.mjs

@@ -13,10 +13,10 @@
  * limitations under the License.
  */
 
-const fs = require("fs");
-const path = require("path");
-const parseAdobeCMap = require("./parse.js").parseAdobeCMap;
-const optimizeCMap = require("./optimize.js").optimizeCMap;
+import fs from "fs";
+import { optimizeCMap } from "./optimize.mjs";
+import { parseAdobeCMap } from "./parse.mjs";
+import path from "path";
 
 function compressCmap(srcPath, destPath, verify) {
   const content = fs.readFileSync(srcPath).toString();
@@ -469,7 +469,7 @@ function incHex(a) {
   return s;
 }
 
-exports.compressCmaps = function (src, dest, verify) {
+function compressCmaps(src, dest, verify) {
   const files = fs.readdirSync(src).filter(function (fn) {
     return !fn.includes("."); // skipping files with the extension
   });
@@ -489,4 +489,6 @@ exports.compressCmaps = function (src, dest, verify) {
         "%"
     );
   });
-};
+}
+
+export { compressCmaps };

external/cmapscompress/optimize.mjs

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-exports.optimizeCMap = function (data) {
+function optimizeCMap(data) {
   let i = 1;
   while (i < data.body.length) {
     if (data.body[i - 1].type === data.body[i].type) {
@@ -206,7 +206,7 @@ exports.optimizeCMap = function (data) {
     }
     i++;
   }
-};
+}
 
 function incHex(a) {
   let c = 1,
@@ -223,3 +223,5 @@ function incHex(a) {
   }
   return s;
 }
+
+export { optimizeCMap };

external/cmapscompress/parse.mjs

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-exports.parseAdobeCMap = function (content) {
+function parseAdobeCMap(content) {
   let m = /(\bbegincmap\b[\s\S]*?)\bendcmap\b/.exec(content);
   if (!m) {
     throw new Error("cmap was not found");
@@ -100,4 +100,6 @@ exports.parseAdobeCMap = function (content) {
   }
 
   return result;
-};
+}
+
+export { parseAdobeCMap };

gulpfile.js

@@ -848,7 +848,7 @@ gulp.task("locale", function () {
   ]);
 });
 
-gulp.task("cmaps", function (done) {
+gulp.task("cmaps", async function () {
   const CMAP_INPUT = "external/cmaps";
   const VIEWER_CMAP_OUTPUT = "external/bcmaps";
 
@@ -869,10 +869,10 @@ gulp.task("cmaps", function (done) {
     }
   });
 
-  const compressCmaps =
-    require("./external/cmapscompress/compress.js").compressCmaps;
+  const { compressCmaps } = await import(
+    "./external/cmapscompress/compress.mjs"
+  );
   compressCmaps(CMAP_INPUT, VIEWER_CMAP_OUTPUT, true);
-  done();
 });
 
 function preprocessCSS(source, defines) {