add missing import file extensions, add @TODO comments for refactoring

src/features/arab/arabicRequiredLigatures.js

@@ -5,6 +5,9 @@
 import { ContextParams } from '../../tokenizer.js';
 import applySubstitution from '../applySubstitution.js';
 
+// @TODO: use commonFeatureUtils.js for reduction of code duplication
+// once #564 has been merged.
+
 /**
  * Update context params
  * @param {any} tokens a list of tokens

src/features/latn/latinLigatures.js

@@ -5,6 +5,9 @@
 import { ContextParams } from '../../tokenizer.js';
 import applySubstitution from '../applySubstitution.js';
 
+// @TODO: use commonFeatureUtils.js for reduction of code duplication
+// once #564 has been merged.
+
 /**
  * Update context params
  * @param {any} tokens a list of tokens

src/tables/gvar.js

@@ -1,9 +1,9 @@
 // The `gvar` table stores information on how to modify glyf outlines across the variation space
 // https://learn.microsoft.com/en-us/typography/opentype/spec/gvar
 
-// import check from '../check';
-// import parse from '../parse';
-// import table from '../table';
+// import check from '../check.js';
+// import parse from '../parse.js';
+// import table from '../table.js';
 
 function makeGvarTable() {
     console.warn('Writing of gvar tables is not yet supported.');

test/tables/avar.js

@@ -1,6 +1,6 @@
 import assert from 'assert';
-import { hex, unhex } from '../testutil';
-import avar from '../../src/tables/avar';
+import { hex, unhex } from '../testutil.js';
+import avar from '../../src/tables/avar.js';
 
 describe('tables/avar.js', function() {
     const fvar = {axes: [

test/tables/stat.js

@@ -1,6 +1,6 @@
 import assert from 'assert';
-import { hex, unhex } from '../testutil';
-import STAT from '../../src/tables/stat';
+import { hex, unhex } from '../testutil.js';
+import STAT from '../../src/tables/stat.js';
 
 describe('tables/stat.js', function() {
     // Style Attributes Header, v1.2