Component Library scaffolding (#625)

components/src/button/Button.stories.ts

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+import { Meta, Story } from "@storybook/angular";
+
+import { ButtonComponent } from "./button.component";
+
+// More on default export: https://storybook.js.org/docs/angular/writing-stories/introduction#default-export
+export default {
+  title: "Jslib/Button",
+  component: ButtonComponent,
+  args: {
+    buttonType: "primary",
+  },
+  // More on argTypes: https://storybook.js.org/docs/angular/api/argtypes
+} as Meta;
+
+// More on component templates: https://storybook.js.org/docs/angular/writing-stories/introduction#using-args
+const Template: Story<ButtonComponent> = (args: ButtonComponent) => ({
+  props: args,
+  template: `<button bit-button [buttonType]="buttonType" [block]="block">Test</button>`,
+});
+
+export const Primary = Template.bind({});
+// More on args: https://storybook.js.org/docs/angular/writing-stories/args
+Primary.args = {
+  buttonType: "primary",
+};
+
+export const Secondary = Template.bind({});
+Secondary.args = {
+  buttonType: "secondary",
+};
+
+export const Danger = Template.bind({});
+Danger.args = {
+  buttonType: "danger",
+};
+
+const DisabledTemplate: Story = (args) => ({
+  props: args,
+  template: `
+    <button bit-button disabled buttonType="primary" class="tw-mr-2">Primary</button>
+    <button bit-button disabled buttonType="secondary" class="tw-mr-2">Secondary</button>
+    <button bit-button disabled buttonType="danger" class="tw-mr-2">Danger</button>
+  `,
+});
+
+export const Disabled = DisabledTemplate.bind({});
+Disabled.args = {
+  size: "small",
+};

components/src/button/button.component.spec.ts

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+import { Component } from "@angular/core";
+import { TestBed, waitForAsync } from "@angular/core/testing";
+import { By } from "@angular/platform-browser";
+
+import { ButtonModule } from "./index";
+
+describe("Button", () => {
+  beforeEach(
+    waitForAsync(() => {
+      TestBed.configureTestingModule({
+        imports: [ButtonModule],
+        declarations: [TestApp],
+      });
+
+      TestBed.compileComponents();
+    })
+  );
+
+  it("should apply classes based on type", () => {
+    const fixture = TestBed.createComponent(TestApp);
+
+    const testAppComponent: TestApp = fixture.debugElement.componentInstance;
+    const buttonDebugElement = fixture.debugElement.query(By.css("button"));
+    const linkDebugElement = fixture.debugElement.query(By.css("a"));
+
+    testAppComponent.buttonType = "primary";
+    fixture.detectChanges();
+    expect(buttonDebugElement.nativeElement.classList.contains("tw-bg-primary-500")).toBe(true);
+    expect(linkDebugElement.nativeElement.classList.contains("tw-bg-primary-500")).toBe(true);
+
+    testAppComponent.buttonType = "secondary";
+    fixture.detectChanges();
+    expect(buttonDebugElement.nativeElement.classList.contains("tw-border-text-muted")).toBe(true);
+    expect(linkDebugElement.nativeElement.classList.contains("tw-border-text-muted")).toBe(true);
+
+    testAppComponent.buttonType = "danger";
+    fixture.detectChanges();
+    expect(buttonDebugElement.nativeElement.classList.contains("tw-border-danger-500")).toBe(true);
+    expect(linkDebugElement.nativeElement.classList.contains("tw-border-danger-500")).toBe(true);
+
+    testAppComponent.buttonType = null;
+    fixture.detectChanges();
+    expect(buttonDebugElement.nativeElement.classList.contains("tw-border-text-muted")).toBe(true);
+    expect(linkDebugElement.nativeElement.classList.contains("tw-border-text-muted")).toBe(true);
+  });
+});
+
+@Component({
+  selector: "test-app",
+  template: `
+    <button type="button" bit-button [buttonType]="buttonType">Button</button>
+    <a href="#" bit-button [buttonType]="buttonType"> Link </a>
+  `,
+})
+class TestApp {
+  buttonType: string;
+}

components/src/button/button.component.ts

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+import { Input, HostBinding, OnChanges, Directive } from "@angular/core";
+
+export type ButtonTypes = "primary" | "secondary" | "danger";
+
+const buttonStyles: Record<ButtonTypes, string> = {
+  primary: [
+    "tw-border-primary-500",
+    "tw-bg-primary-500",
+    "!tw-text-contrast",
+    "hover:tw-bg-primary-700",
+    "hover:tw-border-primary-700",
+    "focus:tw-bg-primary-700",
+    "focus:tw-border-primary-700",
+  ].join(" "),
+  secondary: [
+    "tw-bg-transparent",
+    "tw-border-text-muted",
+    "!tw-text-muted",
+    "hover:tw-bg-secondary-500",
+    "hover:tw-border-secondary-500",
+    "hover:tw-text-contrast",
+    "focus:tw-bg-secondary-500",
+    "focus:tw-border-secondary-500",
+    "focus:tw-text-contrast",
+  ].join(" "),
+  danger: [
+    "tw-bg-transparent",
+    "tw-border-danger-500",
+    "!tw-text-danger",
+    "hover:tw-bg-danger-500",
+    "hover:tw-border-danger-500",
+    "hover:tw-text-contrast",
+    "focus:tw-bg-danger-500",
+    "focus:tw-border-danger-500",
+    "focus:tw-text-contrast",
+  ].join(" "),
+};
+
+@Directive({
+  selector: "button[bit-button], a[bit-button]",
+})
+export class ButtonComponent implements OnChanges {
+  @HostBinding("class") @Input("class") classList = "";
+
+  @Input()
+  buttonType: ButtonTypes = "secondary";
+
+  @Input()
+  block = false;
+
+  ngOnChanges() {
+    this.classList = this.classes.join(" ");
+  }
+
+  get classes(): string[] {
+    return [
+      "tw-font-semibold",
+      "tw-py-1.5",
+      "tw-px-3",
+      "tw-rounded",
+      "tw-transition",
+      "tw-border",
+      "tw-border-solid",
+      "tw-text-center",
+      "hover:tw-no-underline",
+      "disabled:tw-bg-secondary-100",
+      "disabled:tw-border-secondary-100",
+      "disabled:!tw-text-main",
+      "focus:tw-outline-none",
+      "focus:tw-ring",
+      "focus:tw-ring-offset-2",
+      "focus:tw-ring-primary-700",
+      this.block ? "tw-w-full tw-block" : "",
+      buttonStyles[this.buttonType ?? "secondary"],
+    ];
+  }
+}

components/src/button/button.module.ts

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+import { CommonModule } from "@angular/common";
+import { NgModule } from "@angular/core";
+
+import { ButtonComponent } from "./button.component";
+
+@NgModule({
+  imports: [CommonModule],
+  exports: [ButtonComponent],
+  declarations: [ButtonComponent],
+})
+export class ButtonModule {}

components/src/button/index.ts

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+export * from "./button.component";
+export * from "./button.module";