Major 4.0 (#380)

- Migrated to WXT
- Migrated to NPM
- Added Insert & copy action
- Added ESLint

entrypoints/popup/specials/Snow.styles.ts

@@ -0,0 +1,46 @@
+import { GriffelStyle, makeStyles, tokens } from "@fluentui/react-components";
+
+const random = (max: number): number => Math.floor(Math.random() * max);
+
+export const SNOWFLAKES_NUM: number = 100;
+
+export const useStyles = makeStyles({
+	snow:
+	{
+		position: "absolute",
+		overflow: "hidden",
+		pointerEvents: "none",
+
+		top: 0,
+		left: 0,
+		bottom: 0,
+		right: 0,
+	},
+	snowflake:
+	{
+		"--size": "1px",
+		width: "var(--size)",
+		height: "var(--size)",
+		backgroundColor: tokens.colorScrollbarOverlay,
+		borderRadius: tokens.borderRadiusCircular,
+		position: "absolute",
+		top: "-5px",
+	},
+	...[...Array(SNOWFLAKES_NUM)].reduce(
+		(acc, _, i): Record<string, GriffelStyle> => ({
+			...acc,
+			[`snowflake-${i}`]: {
+				"--size": `${random(5)}px`,
+				"--left-start": `${random(20) - 10}vw`,
+				"--left-end": `${random(20) - 10}vw`,
+				left: `${random(100)}vw`,
+				animationName: "snowfall",
+				animationDuration: `${5 + random(10)}s`,
+				animationTimingFunction: "linear",
+				animationIterationCount: "infinite",
+				animationDelay: `-${random(10)}s`,
+			},
+		}),
+		{},
+	),
+});

entrypoints/popup/specials/Snow.tsx

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+import { mergeClasses } from "@fluentui/react-components";
+import { SNOWFLAKES_NUM, useStyles } from "./Snow.styles";
+
+const Snow: React.FC = () =>
+{
+	const cls = useStyles();
+
+	if (![0, 11].includes(new Date().getMonth()))
+		return null;
+
+	return (
+		<div className={ cls.snow }>
+			{ [...Array(SNOWFLAKES_NUM)].map((_, i) =>
+				<div key={ i } className={ mergeClasses(cls.snowflake, cls[`snowflake-${i}`]) } />
+			) }
+		</div>
+	);
+};
+
+export default Snow;