[ML] Injectables refactor (elastic#50512) (elastic#50910)

* [ML] Injectables refactor

* removing unrelated files

* additional typescript conversion

* more typescript conversion

* adding some return types

* fixing eui errors

* typescripting license checks

* updated based on review

* fixing merge conflict error

* converting tests to jest

* fixing types

x-pack/legacy/plugins/ml/common/util/group_color_utils.js → x-pack/legacy/plugins/ml/common/util/group_color_utils.ts

@@ -4,9 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import * as euiVars from '@elastic/eui/dist/eui_theme_dark.json';
-import { stringHash } from './string_utils';
-
+import euiVars from '@elastic/eui/dist/eui_theme_dark.json';
 
 const COLORS = [
   euiVars.euiColorVis0,
@@ -20,18 +18,32 @@ const COLORS = [
   euiVars.euiColorVis8,
   euiVars.euiColorVis9,
   euiVars.euiColorDarkShade,
-  euiVars.euiColorPrimary
+  euiVars.euiColorPrimary,
 ];
 
-const colorMap = {};
+const colorMap: Record<string, string> = {};
 
-export function tabColor(name) {
+export function tabColor(name: string): string {
   if (colorMap[name] === undefined) {
     const n = stringHash(name);
-    const color = COLORS[(n % COLORS.length)];
+    const color = COLORS[n % COLORS.length];
     colorMap[name] = color;
     return color;
   } else {
     return colorMap[name];
   }
 }
+
+function stringHash(str: string): number {
+  let hash = 0;
+  let chr = 0;
+  if (str.length === 0) {
+    return hash;
+  }
+  for (let i = 0; i < str.length; i++) {
+    chr = str.charCodeAt(i);
+    hash = (hash << 5) - hash + chr; // eslint-disable-line no-bitwise
+    hash |= 0; // eslint-disable-line no-bitwise
+  }
+  return hash < 0 ? hash * -2 : hash;
+}

x-pack/legacy/plugins/ml/common/util/job_utils.d.ts

@@ -33,3 +33,5 @@ export const ML_DATA_PREVIEW_COUNT: number;
 export function isJobIdValid(jobId: string): boolean;
 
 export function processCreatedBy(customSettings: { created_by?: string }): void;
+
+export function mlFunctionToESAggregation(functionName: string): string | null;

x-pack/legacy/plugins/ml/common/util/parse_interval.test.ts

@@ -0,0 +1,34 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { parseInterval } from './parse_interval';
+
+describe('ML parse interval util', () => {
+  test('correctly parses an interval containing unit and value', () => {
+    expect(parseInterval('1d')!.as('d')).toBe(1);
+    expect(parseInterval('2y')!.as('y')).toBe(2);
+    expect(parseInterval('5M')!.as('M')).toBe(5);
+    expect(parseInterval('5m')!.as('m')).toBe(5);
+    expect(parseInterval('250ms')!.as('ms')).toBe(250);
+    expect(parseInterval('100s')!.as('s')).toBe(100);
+    expect(parseInterval('23d')!.as('d')).toBe(23);
+    expect(parseInterval('52w')!.as('w')).toBe(52);
+    expect(parseInterval('0s')!.as('s')).toBe(0);
+    expect(parseInterval('0s')!.as('h')).toBe(0);
+  });
+
+  test('correctly handles zero value intervals', () => {
+    expect(parseInterval('0h')!.as('h')).toBe(0);
+    expect(parseInterval('0d')).toBe(null);
+  });
+
+  test('returns null for an invalid interval', () => {
+    expect(parseInterval('')).toBe(null);
+    expect(parseInterval('234asdf')).toBe(null);
+    expect(parseInterval('m')).toBe(null);
+    expect(parseInterval('1.5h')).toBe(null);
+  });
+});

x-pack/legacy/plugins/ml/common/util/parse_interval.js → x-pack/legacy/plugins/ml/common/util/parse_interval.ts

@@ -4,17 +4,17 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-
-
-import moment from 'moment';
+import { duration, Duration, unitOfTime } from 'moment';
 import dateMath from '@elastic/datemath';
 
+type SupportedUnits = unitOfTime.Base;
+
 // Assume interval is in the form (value)(unit), such as "1h"
 const INTERVAL_STRING_RE = new RegExp('^([0-9]*)\\s*(' + dateMath.units.join('|') + ')$');
 
 // moment.js is only designed to allow fractional values between 0 and 1
 // for units of hour or less.
-const SUPPORT_ZERO_DURATION_UNITS = ['ms', 's', 'm', 'h'];
+const SUPPORT_ZERO_DURATION_UNITS: SupportedUnits[] = ['ms', 's', 'm', 'h'];
 
 // Parses an interval String, such as 7d, 1h or 30m to a moment duration.
 // Differs from the Kibana ui/utils/parse_interval in the following ways:
@@ -25,22 +25,25 @@ const SUPPORT_ZERO_DURATION_UNITS = ['ms', 's', 'm', 'h'];
 // to work with units less than 'day'.
 // 3. Fractional intervals e.g. 1.5h or 4.5d are not allowed, in line with the behaviour
 // of the Elasticsearch date histogram aggregation.
-export function parseInterval(interval) {
-  const matches = String(interval).trim().match(INTERVAL_STRING_RE);
-  if (!Array.isArray(matches)) return null;
-  if (matches.length < 3) return null;
+export function parseInterval(interval: string): Duration | null {
+  const matches = String(interval)
+    .trim()
+    .match(INTERVAL_STRING_RE);
+  if (!Array.isArray(matches) || matches.length < 3) {
+    return null;
+  }
 
   try {
-    const value = parseInt(matches[1]);
-    const unit = matches[2];
+    const value = parseInt(matches[1], 10);
+    const unit = matches[2] as SupportedUnits;
 
     // In line with moment.js, only allow zero value intervals when the unit is less than 'day'.
     // And check for isNaN as e.g. valueless 'm' will pass the regex test.
-    if (isNaN(value) || (value < 1 && SUPPORT_ZERO_DURATION_UNITS.indexOf(unit) === -1))  {
+    if (isNaN(value) || (value < 1 && SUPPORT_ZERO_DURATION_UNITS.indexOf(unit) === -1)) {
       return null;
     }
 
-    return moment.duration(value, unit);
+    return duration(value, unit);
   } catch (e) {
     return null;
   }

x-pack/legacy/plugins/ml/common/util/__tests__/string_utils.js → x-pack/legacy/plugins/ml/common/util/string_utils.test.ts

@@ -4,29 +4,24 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-
-
-import expect from '@kbn/expect';
-import { renderTemplate } from '../string_utils';
+import { renderTemplate } from './string_utils';
 
 describe('ML - string utils', () => {
   describe('renderTemplate', () => {
-
-    it('returns plain string', () => {
+    test('returns plain string', () => {
       const templateString = 'plain string';
       const result = renderTemplate(templateString);
-      expect(result).to.be(result);
+      expect(result).toBe(result);
     });
-    it('returns rendered template with one replacement', () => {
+    test('returns rendered template with one replacement', () => {
       const templateString = 'string with {{one}} replacement';
       const result = renderTemplate(templateString, { one: '1' });
-      expect(result).to.be('string with 1 replacement');
+      expect(result).toBe('string with 1 replacement');
     });
-    it('returns rendered template with two replacements', () => {
+    test('returns rendered template with two replacements', () => {
       const templateString = 'string with {{one}} replacement, and a {{two}} one.';
       const result = renderTemplate(templateString, { one: '1', two: '2nd' });
-      expect(result).to.be('string with 1 replacement, and a 2nd one.');
+      expect(result).toBe('string with 1 replacement, and a 2nd one.');
     });
-
   });
 });

x-pack/legacy/plugins/ml/common/util/string_utils.js → x-pack/legacy/plugins/ml/common/util/string_utils.ts

@@ -4,33 +4,16 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-
-
-
 // A simple template renderer, it replaces mustache/angular style {{...}} tags with
 // the values provided via the data object
-export function renderTemplate(str, data) {
+export function renderTemplate(str: string, data?: Record<string, string>): string {
   const matches = str.match(/{{(.*?)}}/g);
 
-  if (Array.isArray(matches)) {
+  if (Array.isArray(matches) && data !== undefined) {
     matches.forEach(v => {
       str = str.replace(v, data[v.replace(/{{|}}/g, '')]);
     });
   }
 
   return str;
 }
-
-export function stringHash(str) {
-  let hash = 0;
-  let chr = '';
-  if (str.length === 0) {
-    return hash;
-  }
-  for (let i = 0; i < str.length; i++) {
-    chr = str.charCodeAt(i);
-    hash = ((hash << 5) - hash) + chr;
-    hash |= 0;
-  }
-  return hash < 0 ? hash * -2 : hash;
-}