Add utility tests and minimumChangeThreshold option

README.md

@@ -86,3 +86,13 @@ In the example below, a filename `foo.abcde.chunk.js` will be converted to `foo.
 ```yaml
   strip-hash: "\\.(\\w{5})\\.chunk\\.js$"
 ```
+
+### Increasing the required threshold
+
+By default, a file that's been changed by a single byte will be reported as changed. If you'd prefer to require a certain minimum threshold for a file to be changed, you can specify `minimum-change-threshold` in bytes:
+
+```yaml
+  minimum-change-threshold: 100
+```
+
+In the above example, a file with a delta of less than 100 bytes will be reported as unchanged.

__snapshots__/utils.spec.js.snap

@@ -0,0 +1,111 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`diffTable 1`] = `
+"**Size Change:** +9 B (0%) 
+
+**Total Size:** 4.8 kB
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`one.js\` | 5 kB | +2.5 kB (50%) | 🆘 |
+| \`two.js\` | -5 kB | -2.5 kB (50%) | 🆘 |
+| \`four.js\` | 4.5 kB | +9 B (0%) |  |
+
+<details><summary>ℹ️ <strong>View Unchanged</strong></summary>
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`three.js\` | 300 B | 0 B |  |
+
+
+</details>
+
+"
+`;
+
+exports[`diffTable 2`] = `
+"| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`one.js\` | 5 kB | +2.5 kB (50%) | 🆘 |
+| \`two.js\` | -5 kB | -2.5 kB (50%) | 🆘 |
+| \`four.js\` | 4.5 kB | +9 B (0%) |  |
+
+<details><summary>ℹ️ <strong>View Unchanged</strong></summary>
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`three.js\` | 300 B | 0 B |  |
+
+
+</details>
+
+"
+`;
+
+exports[`diffTable 3`] = `
+"**Size Change:** +9 B (0%) 
+
+**Total Size:** 4.8 kB
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`one.js\` | 5 kB | +2.5 kB (50%) | 🆘 |
+| \`two.js\` | -5 kB | -2.5 kB (50%) | 🆘 |
+| \`three.js\` | 300 B | 0 B |  |
+| \`four.js\` | 4.5 kB | +9 B (0%) |  |
+"
+`;
+
+exports[`diffTable 4`] = `
+"**Size Change:** +9 B (0%) 
+
+**Total Size:** 4.8 kB
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`one.js\` | 5 kB | +2.5 kB (50%) | 🆘 |
+| \`two.js\` | -5 kB | -2.5 kB (50%) | 🆘 |
+| \`four.js\` | 4.5 kB | +9 B (0%) |  |
+"
+`;
+
+exports[`diffTable 5`] = `
+"**Size Change:** +9 B (0%) 
+
+**Total Size:** 4.8 kB
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`one.js\` | 5 kB | +2.5 kB (50%) | 🆘 |
+| \`two.js\` | -5 kB | -2.5 kB (50%) | 🆘 |
+
+<details><summary>ℹ️ <strong>View Unchanged</strong></summary>
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`three.js\` | 300 B | 0 B |  |
+| \`four.js\` | 4.5 kB | +9 B (0%) |  |
+
+
+</details>
+
+"
+`;
+
+exports[`diffTable 6`] = `
+"**Size Change:** 0 B 
+
+**Total Size:** 300 B
+
+
+<details><summary>ℹ️ <strong>View Unchanged</strong></summary>
+
+| Filename | Size | Change | |
+|:--- |:---:|:---:|:---:|
+| \`three.js\` | 300 B | 0 B |  |
+
+
+</details>
+
+"
+`;

action.js

@@ -1,40 +1,9 @@
 import path from 'path';
-import fs from 'fs';
 import { getInput, setFailed, startGroup, endGroup, debug } from '@actions/core';
 import { GitHub, context } from '@actions/github';
 import { exec } from '@actions/exec';
 import SizePlugin from 'size-plugin-core';
-import prettyBytes from 'pretty-bytes';
-
-
-async function fileExists(filename) {
-	try {
-		await fs.promises.access(filename, fs.constants.F_OK);
-		return true;
-	} catch (e) {}
-	return false;
-}
-
-function stripHash(regex) {
-	if (regex) {
-		console.log(`Striping hash from build chunks using '${regex}' pattern.`);
-		return function(fileName) {
-			return fileName.replace(new RegExp(regex), (str, ...hashes) => {
-				hashes = hashes.slice(0, -2).filter(c => c != null);
-				if (hashes.length) {
-					for (let i=0; i<hashes.length; i++) {
-						const hash = hashes[i] || '';
-						str = str.replace(hash, hash.replace(/./g, '*'));
-					}
-					return str;
-				}
-				return '';
-			});
-		}
-	}
-
-	return undefined;
-}
+import { fileExists, diffTable, toBool, stripHash } from './utils';
 
 
 async function run(octokit, context, token) {
@@ -137,7 +106,8 @@ async function run(octokit, context, token) {
 	const markdownDiff = diffTable(diff, {
 		collapseUnchanged: toBool(getInput('collapse-unchanged')),
 		omitUnchanged: toBool(getInput('omit-unchanged')),
-		showTotal: toBool(getInput('show-total'))
+		showTotal: toBool(getInput('show-total')),
+		minimumChangeThreshold: parseInt(getInput('minimum-change-threshold'), 10)
 	});
 
 	let outputRawMarkdown = false;
@@ -258,85 +228,6 @@ async function createCheck(octokit, context) {
     };
 }
 
-
-function diffTable(files, { showTotal, collapseUnchanged, omitUnchanged }) {
-	let out = `| Filename | Size | Change | |\n`;
-	out += `|:--- |:---:|:---:|:---:|\n`;
-
-	let outUnchanged = out;
-
-	let totalSize = 0;
-	let totalDelta = 0;
-	let unchanged = 0;
-	let changed = 0;
-	for (const file of files) {
-		const { filename, size, delta } = file;
-		totalSize += size;
-		totalDelta += delta;
-
-		const difference = (delta / size * 100) | 0;
-		let deltaText = getDeltaText(delta, difference);
-		let icon = iconForDifference(difference);
-		const s = `| \`${filename}\` | ${prettyBytes(size)} | ${deltaText} | ${icon} |\n`;
-		const isUnchanged = Math.abs(delta) < 1;
-
-		if (isUnchanged && omitUnchanged) continue;
-
-		if (isUnchanged && collapseUnchanged) {
-			unchanged++;
-			outUnchanged += s;
-		}
-		else {
-			changed++;
-			out += s;
-		}
-	}
-
-	// no changes, don't show an empty table
-	if (!changed) {
-		out = '';
-	}
-
-	if (unchanged) {
-		out += `\n<details><summary>ℹ️ <strong>View Unchanged</strong></summary>\n\n${outUnchanged}\n\n</details>\n\n`;
-	}
-
-	if (showTotal) {
-		const totalDifference = (totalDelta / totalSize * 100) | 0;
-		let totalDeltaText = getDeltaText(totalDelta, totalDifference);
-		let totalIcon = iconForDifference(totalDifference);
-		out = `**Total Size:** ${prettyBytes(totalSize)}\n\n${out}`;
-		out = `**Size Change:** ${totalDeltaText} ${totalIcon}\n\n${out}`;
-	}
-
-	return out;
-}
-
-function getDeltaText(delta, difference) {
-	let deltaText = (delta > 0 ? '+' : '') + prettyBytes(delta);
-	if (delta && Math.abs(delta) > 1) {
-		deltaText += ` (${Math.abs(difference)}%)`;
-	}
-	return deltaText;
-}
-
-function iconForDifference(difference) {
-	let icon = '';
-	if (difference >= 50) icon = '🆘';
-	else if (difference >= 20) icon = '🚨';
-	else if (difference >= 10) icon = '⚠️';
-	else if (difference >= 5) icon = '🔍';
-	else if (difference <= -50) icon = '🏆';
-	else if (difference <= -20) icon = '🎉';
-	else if (difference <= -10) icon = '👏';
-	else if (difference <= -5) icon = '✅';
-	return icon;
-}
-
-function toBool(v) {
-	return /^(1|true|yes)$/.test(v);
-}
-
 (async () => {
 	try {
 		const token = getInput('repo-token', { required: true });

action.yml

@@ -25,6 +25,9 @@ inputs:
     description: 'A regular expression to remove hashes from filenames. Submatches are turned into asterisks if present, otherwise the whole match is removed.'
   use-check:
     description: 'Report status as a CI Check instead of using a comment [experimental]'
+  minimum-change-threshold:
+    description: 'Consider files with changes below this threshold as unchanged. Specified in bytes.'
+    default: 1
   pattern:
     description: 'minimatch pattern of files to track'
     default:  '**/dist/**/*.js'

babel.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+	presets: [
+		[
+			'@babel/preset-env',
+			{
+				targets: {
+					node: 'current'
+				}
+			}
+		]
+	]
+};

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	testEnvironment: 'node'
+};