diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..c3b2ecf
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,38 @@
+name: Build and Upload Artifacts
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+    - uses: oven-sh/setup-bun@v1
+
+    - name: Build for Linux x64
+      run: bun build --compile --target=bun-linux-x64 ./index.ts --outfile mycli-linux-x64
+
+    - name: Build for Linux ARM64
+      run: bun build --compile --target=bun-linux-arm64 ./index.ts --outfile mycli-linux-arm64
+
+    - name: Build for Windows x64
+      run: bun build --compile --target=bun-windows-x64 ./index.ts --outfile mycli-windows-x64.exe
+
+    - name: Build for macOS x64
+      run: bun build --compile --target=bun-darwin-x64 ./index.ts --outfile mycli-macos-x64
+
+    - name: Build for macOS arm64
+      run: bun build --compile --target=bun-darwin-arm64 ./index.ts --outfile mycli-macos-arm64
+
+    - name: Upload Artifacts
+      uses: actions/upload-artifact@v2
+      with:
+        name: mycli
+        path: |
+          mycli-linux-x64
+          mycli-linux-arm64
+          mycli-windows-x64.exe
+          mycli-macos-x64
+          mycli-macos-arm64
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index ed0d3c8..91cfaf8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -86,3 +86,6 @@ typings/
 
 # DynamoDB Local files
 .dynamodb/
+
+converted/
+calendar.ics
\ No newline at end of file
diff --git a/bun.lockb b/bun.lockb
new file mode 100755
index 0000000..973949f
Binary files /dev/null and b/bun.lockb differ
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..6e757ed
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,60 @@
+const initialPerf = performance.now()
+import { getEventsFromICS } from './utils/ics'
+import jsonToFrontmatter from './utils/jsonToFrontmatter'
+import { parseArgs } from 'util'
+import { argsSchema } from "./utils/types/schema";
+import removeLastSlash from "./utils/removeLastSlash";
+import getAverage from './utils/getAverage';
+
+const { values } = parseArgs({
+    args: Bun.argv,
+    options: {
+        out: {
+            type: 'string'
+        },
+        ics: {
+            type: 'string'
+        }
+    },
+    strict: true,
+    allowPositionals: true,
+})
+
+const parsedValues = argsSchema.safeParse(values)
+if (!parsedValues.success) {
+    console.error(parsedValues.error)
+    process.exit(1)
+}
+
+const file = Bun.file(parsedValues.data.ics)
+
+const parsed = getEventsFromICS(await file.text())
+
+const events = parsed.map(event => {
+    const [ics, uid, date, type] = event.id!.split('::')
+    return {
+        fileName: `${date} ${event.title.trim()}.md`,
+        frontmatterContent: jsonToFrontmatter(event)
+    }
+})
+
+const writePerfArray: number[] = []
+for (const event of events) {
+    if (writePerfArray.length > 0) {
+        process.stdout.moveCursor(0, -1) // up one line
+        process.stdout.clearLine(1)
+    }
+    console.log(`[#${writePerfArray.length + 1}] Writing ${event.fileName}`)
+
+    const initialWritePerf = performance.now()
+
+    await Bun.write(`${removeLastSlash(parsedValues.data.out)}/${event.fileName}`, event.frontmatterContent)
+
+    const finalWritePerf = performance.now()
+    writePerfArray.push(finalWritePerf - initialWritePerf)
+}
+
+const finalPerf = performance.now()
+
+console.log(`[DONE] Finished in ${(finalPerf - initialPerf).toFixed(2)}ms`)
+console.log(`[DONE] Average write time: ${(getAverage(writePerfArray) * 1000).toFixed(2)}µs`)
\ No newline at end of file
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..a904d2a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "full-calendar-ics-converter",
+  "version": "1.0.0",
+  "module": "index.ts",
+  "type": "module",
+  "devDependencies": {
+    "@types/bun": "latest",
+    "@types/ical": "^0.8.3",
+    "@types/luxon": "^3.4.2"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "ical.js": "^2.0.1",
+    "luxon": "^3.4.4",
+    "node-ical": "^0.18.0",
+    "rrule": "^2.8.1",
+    "zod": "^3.23.8"
+  }
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..238655f
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext", "DOM"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}
diff --git a/utils/getAverage.ts b/utils/getAverage.ts
new file mode 100644
index 0000000..30e9dd8
--- /dev/null
+++ b/utils/getAverage.ts
@@ -0,0 +1,3 @@
+export default function getAverage(arr: number[]): number {
+    return arr.reduce((a, b) => a + b, 0) / arr.length;
+}
\ No newline at end of file
diff --git a/utils/ics.ts b/utils/ics.ts
new file mode 100644
index 0000000..74f052e
--- /dev/null
+++ b/utils/ics.ts
@@ -0,0 +1,153 @@
+// @ts-nocheck
+import ical from "ical.js";
+import { type OFCEvent, validateEvent } from "./types";
+import { DateTime } from "luxon";
+import { rrulestr } from "rrule";
+
+function getDate(t: ical.Time): string {
+    return DateTime.fromSeconds(t.toUnixTime(), { zone: "UTC" }).toISODate();
+}
+
+function getTime(t: ical.Time): string {
+    if (t.isDate) {
+        return "00:00";
+    }
+    return DateTime.fromSeconds(t.toUnixTime(), { zone: "UTC" }).toISOTime({
+        includeOffset: false,
+        includePrefix: false,
+        suppressMilliseconds: true,
+        suppressSeconds: true,
+    });
+}
+
+function extractEventUrl(iCalEvent: ical.Event): string {
+    let urlProp = iCalEvent.component.getFirstProperty("url");
+    return urlProp ? urlProp.getFirstValue() : "";
+}
+
+function specifiesEnd(iCalEvent: ical.Event) {
+    return (
+        Boolean(iCalEvent.component.getFirstProperty("dtend")) ||
+        Boolean(iCalEvent.component.getFirstProperty("duration"))
+    );
+}
+
+function icsToOFC(input: ical.Event): OFCEvent {
+    if (input.isRecurring()) {
+        const rrule = rrulestr(
+            input.component.getFirstProperty("rrule").getFirstValue().toString()
+        );
+        const allDay = input.startDate.isDate;
+        const exdates = input.component
+            .getAllProperties("exdate")
+            .map((exdateProp) => {
+                const exdate = exdateProp.getFirstValue();
+                // NOTE: We only store the date from an exdate and recreate the full datetime exdate later,
+                // so recurring events with exclusions that happen more than once per day are not supported.
+                return getDate(exdate);
+            });
+
+        return {
+            type: "rrule",
+            title: input.summary,
+            id: `ics::${input.uid}::${getDate(input.startDate)}::recurring`,
+            rrule: rrule.toString(),
+            skipDates: exdates,
+            startDate: getDate(
+                input.startDate.convertToZone(ical.Timezone.utcTimezone)
+            ),
+            ...(allDay
+                ? { allDay: true }
+                : {
+                      allDay: false,
+                      startTime: getTime(
+                          input.startDate.convertToZone(
+                              ical.Timezone.utcTimezone
+                          )
+                      ),
+                      endTime: getTime(
+                          input.endDate.convertToZone(ical.Timezone.utcTimezone)
+                      ),
+                  }),
+        };
+    } else {
+        const date = getDate(input.startDate);
+        const endDate =
+            specifiesEnd(input) && input.endDate
+                ? getDate(input.endDate)
+                : undefined;
+        const allDay = input.startDate.isDate;
+        return {
+            type: "single",
+            id: `ics::${input.uid}::${date}::single`,
+            title: input.summary,
+            date,
+            endDate: date !== endDate ? endDate || null : null,
+            ...(allDay
+                ? { allDay: true }
+                : {
+                      allDay: false,
+                      startTime: getTime(input.startDate),
+                      endTime: getTime(input.endDate),
+                  }),
+        };
+    }
+}
+
+export function getEventsFromICS(text: string): OFCEvent[] {
+    const jCalData = ical.parse(text);
+    const component = new ical.Component(jCalData);
+
+    // TODO: Timezone support
+    // const tzc = component.getAllSubcomponents("vtimezone");
+    // const tz = new ical.Timezone(tzc[0]);
+
+    const events: ical.Event[] = component
+        .getAllSubcomponents("vevent")
+        .map((vevent) => new ical.Event(vevent))
+        .filter((evt) => {
+            evt.iterator;
+            try {
+                evt.startDate.toJSDate();
+                evt.endDate.toJSDate();
+                return true;
+            } catch (err) {
+                // skipping events with invalid time
+                return false;
+            }
+        });
+
+    // Events with RECURRENCE-ID will have duplicated UIDs.
+    // We need to modify the base event to exclude those recurrence exceptions.
+    const baseEvents = Object.fromEntries(
+        events
+            .filter((e) => e.recurrenceId === null)
+            .map((e) => [e.uid, icsToOFC(e)])
+    );
+
+    const recurrenceExceptions = events
+        .filter((e) => e.recurrenceId !== null)
+        .map((e): [string, OFCEvent] => [e.uid, icsToOFC(e)]);
+
+    for (const [uid, event] of recurrenceExceptions) {
+        const baseEvent = baseEvents[uid];
+        if (!baseEvent) {
+            continue;
+        }
+
+        if (baseEvent.type !== "rrule" || event.type !== "single") {
+            console.warn(
+                "Recurrence exception was recurring or base event was not recurring",
+                { baseEvent, recurrenceException: event }
+            );
+            continue;
+        }
+        baseEvent.skipDates.push(event.date);
+    }
+
+    const allEvents = Object.values(baseEvents).concat(
+        recurrenceExceptions.map((e) => e[1])
+    );
+
+    return allEvents.map(validateEvent).flatMap((e) => (e ? [e] : []));
+}
diff --git a/utils/jsonToFrontmatter.ts b/utils/jsonToFrontmatter.ts
new file mode 100644
index 0000000..792d8d2
--- /dev/null
+++ b/utils/jsonToFrontmatter.ts
@@ -0,0 +1,7 @@
+export default function jsonToFrontmatter(json: any): string {
+    return `---
+${Object.entries(json)
+    .map(([key, value]) => `${key}: ${JSON.stringify(value)}`)
+    .join("\n")}
+---`;
+}
\ No newline at end of file
diff --git a/utils/removeLastSlash.ts b/utils/removeLastSlash.ts
new file mode 100644
index 0000000..286e99c
--- /dev/null
+++ b/utils/removeLastSlash.ts
@@ -0,0 +1,3 @@
+export default function removeLastSlash(str: string): string {
+    return str.replace(/\/$/, "");
+}
\ No newline at end of file
diff --git a/utils/types/calendar_settings.ts b/utils/types/calendar_settings.ts
new file mode 100644
index 0000000..c3837cd
--- /dev/null
+++ b/utils/types/calendar_settings.ts
@@ -0,0 +1,75 @@
+import { ZodError, z } from "zod";
+import type { OFCEvent } from "./schema";
+
+const calendarOptionsSchema = z.discriminatedUnion("type", [
+    z.object({ type: z.literal("local"), directory: z.string() }),
+    z.object({ type: z.literal("dailynote"), heading: z.string() }),
+    z.object({ type: z.literal("ical"), url: z.string().url() }),
+    z.object({
+        type: z.literal("caldav"),
+        name: z.string(),
+        url: z.string().url(),
+        homeUrl: z.string().url(),
+        username: z.string(),
+        password: z.string(),
+    }),
+]);
+
+const colorValidator = z.object({ color: z.string() });
+
+export type TestSource = {
+    type: "FOR_TEST_ONLY";
+    id: string;
+    events?: OFCEvent[];
+};
+
+export type CalendarInfo = (
+    | z.infer<typeof calendarOptionsSchema>
+    | TestSource
+) &
+    z.infer<typeof colorValidator>;
+
+export function parseCalendarInfo(obj: unknown): CalendarInfo {
+    const options = calendarOptionsSchema.parse(obj);
+    const color = colorValidator.parse(obj);
+
+    return { ...options, ...color };
+}
+
+export function safeParseCalendarInfo(obj: unknown): CalendarInfo | null {
+    try {
+        return parseCalendarInfo(obj);
+    } catch (e) {
+        if (e instanceof ZodError) {
+            console.debug("Parsing calendar info failed with errors", {
+                obj,
+                error: e.message,
+            });
+        }
+        return null;
+    }
+}
+
+/**
+ * Construct a partial calendar source of the specified type
+ */
+export function makeDefaultPartialCalendarSource(
+    type: CalendarInfo["type"] | "icloud"
+): Partial<CalendarInfo> {
+    if (type === "icloud") {
+        return {
+            type: "caldav",
+            color: getComputedStyle(document.body)
+                .getPropertyValue("--interactive-accent")
+                .trim(),
+            url: "https://caldav.icloud.com",
+        };
+    }
+
+    return {
+        type: type,
+        color: getComputedStyle(document.body)
+            .getPropertyValue("--interactive-accent")
+            .trim(),
+    };
+}
diff --git a/utils/types/index.ts b/utils/types/index.ts
new file mode 100644
index 0000000..460bb43
--- /dev/null
+++ b/utils/types/index.ts
@@ -0,0 +1,29 @@
+import type { CalendarInfo } from "./calendar_settings";
+
+export type { OFCEvent } from "./schema";
+export { validateEvent } from "./schema";
+
+export { makeDefaultPartialCalendarSource } from "./calendar_settings";
+export type { CalendarInfo } from "./calendar_settings";
+
+export const PLUGIN_SLUG = "full-calendar-plugin";
+
+export class FCError {
+    message: string;
+    constructor(message: string) {
+        this.message = message;
+    }
+}
+
+export type EventLocation = {
+    file: { path: string };
+    lineNumber: number | undefined;
+};
+
+export type Authentication = {
+    type: "basic";
+    username: string;
+    password: string;
+};
+
+export type CalDAVSource = Extract<CalendarInfo, { type: "caldav" }>;
diff --git a/utils/types/schema.ts b/utils/types/schema.ts
new file mode 100644
index 0000000..c89e787
--- /dev/null
+++ b/utils/types/schema.ts
@@ -0,0 +1,136 @@
+import { z, ZodError } from "zod";
+import { DateTime, Duration } from "luxon";
+
+const stripTime = (date: DateTime) => {
+    // Strip time from luxon dateTime.
+    return DateTime.fromObject(
+        {
+            year: date.year,
+            month: date.month,
+            day: date.day,
+        },
+        { zone: "utc" }
+    );
+};
+
+export const ParsedDate = z.string();
+// z.string().transform((val, ctx) => {
+//     const parsed = DateTime.fromISO(val, { zone: "utc" });
+//     if (parsed.invalidReason) {
+//         ctx.addIssue({
+//             code: z.ZodIssueCode.custom,
+//             message: parsed.invalidReason,
+//         });
+//         return z.NEVER;
+//     }
+//     return stripTime(parsed);
+// });
+
+export const ParsedTime = z.string();
+// z.string().transform((val, ctx) => {
+//     let parsed = DateTime.fromFormat(val, "h:mm a");
+//     if (parsed.invalidReason) {
+//         parsed = DateTime.fromFormat(val, "HH:mm");
+//     }
+
+//     if (parsed.invalidReason) {
+//         ctx.addIssue({
+//             code: z.ZodIssueCode.custom,
+//             message: parsed.invalidReason,
+//         });
+//         return z.NEVER;
+//     }
+
+//     return Duration.fromISOTime(
+//         parsed.toISOTime({
+//             includeOffset: false,
+//             includePrefix: false,
+//         })
+//     );
+// });
+
+export const TimeSchema = z.discriminatedUnion("allDay", [
+    z.object({ allDay: z.literal(true) }),
+    z.object({
+        allDay: z.literal(false),
+        startTime: ParsedTime,
+        endTime: ParsedTime.nullable().default(null),
+    }),
+]);
+
+export const CommonSchema = z.object({
+    title: z.string(),
+    id: z.string().optional(),
+});
+
+export const EventSchema = z.discriminatedUnion("type", [
+    z.object({
+        type: z.literal("single"),
+        date: ParsedDate,
+        endDate: ParsedDate.nullable().default(null),
+        completed: ParsedDate.or(z.literal(false))
+            .or(z.literal(null))
+            .optional(),
+    }),
+    z.object({
+        type: z.literal("recurring"),
+        daysOfWeek: z.array(z.enum(["U", "M", "T", "W", "R", "F", "S"])),
+        startRecur: ParsedDate.optional(),
+        endRecur: ParsedDate.optional(),
+    }),
+    z.object({
+        type: z.literal("rrule"),
+        startDate: ParsedDate,
+        rrule: z.string(),
+        skipDates: z.array(ParsedDate),
+    }),
+]);
+
+type EventType = z.infer<typeof EventSchema>;
+type TimeType = z.infer<typeof TimeSchema>;
+type CommonType = z.infer<typeof CommonSchema>;
+
+export type OFCEvent = CommonType & TimeType & EventType;
+
+export function parseEvent(obj: unknown): OFCEvent {
+    if (typeof obj !== "object") {
+        throw new Error("value for parsing was not an object.");
+    }
+    const objectWithDefaults = { type: "single", allDay: false, ...obj };
+    return {
+        ...CommonSchema.parse(objectWithDefaults),
+        ...TimeSchema.parse(objectWithDefaults),
+        ...EventSchema.parse(objectWithDefaults),
+    };
+}
+
+export function validateEvent(obj: unknown): OFCEvent | null {
+    try {
+        return parseEvent(obj);
+    } catch (e) {
+        if (e instanceof ZodError) {
+            console.debug("Parsing failed with errors", {
+                obj,
+                message: e.message,
+            });
+        }
+        return null;
+    }
+}
+type Json =
+    | { [key: string]: Json }
+    | Json[]
+    | string
+    | number
+    | true
+    | false
+    | null;
+
+export function serializeEvent(obj: OFCEvent): Json {
+    return { ...obj };
+}
+
+export const argsSchema = z.object({
+    out: z.string(),
+    ics: z.string(),
+});
\ No newline at end of file