Merge pull request #155 from effigies/fix/set-columns

fix: Allow TSV files to have column names matching Map instance methods

src/types/columns.test.ts

@@ -37,6 +37,13 @@ Deno.test('ColumnsMap', async (t) => {
     // @ts-expect-error ibid
     assertEquals(columns.size, ['0'])
   })
+  await t.step('set columns are permissible', () => {
+    const columns = new ColumnsMap()
+    // @ts-expect-error ts thinks size is protected property
+    columns['set'] = ['0']
+    // @ts-expect-error ibid
+    assertEquals(columns.set, ['0'])
+  })
   await t.step('missing columns are undefined', () => {
     const columns = new ColumnsMap()
     columns['a'] = ['0']

src/types/columns.ts

@@ -15,8 +15,14 @@ const columnMapAccessorProxy = {
     prop: symbol | string,
     receiver: ColumnsMap,
   ) {
-    // Map.size exists, so we need to shadow it with the column contents
-    if (prop === 'size') return target.get('size')
+    // Map instance methods/properties that could plasubily be column names:
+    if (
+      ['clear', 'delete', 'keys', 'set', 'values', 'size'].includes(
+        prop as string,
+      )
+    ) {
+      return target.get(prop as string)
+    }
     const value = Reflect.get(target, prop, receiver)
     if (typeof value === 'function') return value.bind(target)
     if (prop === Symbol.iterator) return target[Symbol.iterator].bind(target)