diff --git a/emvar-lite/mod.ts b/emvar-lite/mod.ts
new file mode 100644
index 0000000..16991a5
--- /dev/null
+++ b/emvar-lite/mod.ts
@@ -0,0 +1,253 @@
+
+const starSub = /((\d+\.)*\d+)\.\*/
+
+function incrementLastNumber(list: number[]) {
+    const newList = [...list]
+    newList[newList.length - 1]++
+    return newList
+}
+/**
+ * Will take in a range, like `>1.2` or `<1.2.3.4` or `=1.2` or `1.*`
+ * and return a checker, that has the check function for checking that a version is in the valid
+ * @param range 
+ * @returns 
+ */
+export function rangeOf(range: string | Checker): Checker {
+    return Checker.parse(range)
+}
+
+/**
+ * Used to create a checker that will `and` all the ranges passed in
+ * @param ranges
+ * @returns 
+ */
+export function rangeAnd(...ranges: (string | Checker)[]): Checker {
+    if (ranges.length === 0) {
+        throw new Error('No ranges given');
+    }
+    const [firstCheck, ...rest] = ranges;
+    return Checker.parse(firstCheck).and(...rest);
+}
+
+/**
+ * Used to create a checker that will `or` all the ranges passed in
+ * @param ranges
+ * @returns 
+ */
+export function rangeOr(...ranges: (string | Checker)[]): Checker {
+    if (ranges.length === 0) {
+        throw new Error('No ranges given');
+    }
+    const [firstCheck, ...rest] = ranges;
+    return Checker.parse(firstCheck).or(...rest);
+}
+
+/**
+ * This will negate the checker, so given a checker that checks for >= 1.0.0, it will check for < 1.0.0
+ * @param range 
+ * @returns 
+ */
+export function notRange(range: string | Checker): Checker {
+    return rangeOf(range).not();
+}
+
+
+/**
+ * EmVar is a set of versioning of any pattern like 1 or 1.2 or 1.2.3 or 1.2.3.4 or ..
+ */
+export class EmVar {
+    /**
+     * Convert the range, should be 1.2.* or * into a emvar
+     * Or an already made emvar
+     * IsUnsafe
+     */
+    static from(range: string | EmVar): EmVar {
+        if (range instanceof EmVar) {
+            return range
+        }
+        return EmVar.parse(range)
+    }
+    /**
+     * Convert the range, should be 1.2.* or * into a emvar
+     * IsUnsafe
+     */
+    static parse(range: string): EmVar {
+        const values = range.split('.').map(x => parseInt(x));
+        for (const value of values) {
+            if (isNaN(value)) {
+                throw new Error(`Couldn't parse range: ${range}`);
+            }
+        }
+        return new EmVar(values);
+    }
+    private constructor(public readonly values: number[]) { }
+
+    /**
+     * Used when we need a new emvar that has the last number incremented, used in the 1.* like things
+     */
+    public withLastIncremented() {
+        return new EmVar(incrementLastNumber(this.values))
+    }
+
+    public greaterThan(other: EmVar): boolean {
+        for (const i in this.values) {
+            if (other.values[i] == null) {
+                return true
+            }
+            if (this.values[i] > other.values[i]) {
+                return true;
+            }
+
+            if (this.values[i] < other.values[i]) {
+                return false;
+            }
+        }
+        return false;
+    }
+
+    public equals(other: EmVar): boolean {
+        if (other.values.length !== this.values.length) {
+            return false
+        }
+        for (const i in this.values) {
+            if (this.values[i] !== other.values[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+    public greaterThanOrEqual(other: EmVar): boolean {
+        return this.greaterThan(other) || this.equals(other);
+    }
+    public lessThanOrEqual(other: EmVar): boolean {
+        return !this.greaterThan(other);
+    }
+    public lessThan(other: EmVar): boolean {
+        return !this.greaterThanOrEqual(other);
+    }
+}
+
+/**
+ * A checker is a function that takes a version and returns true if the version matches the checker.
+ * Used when we are doing range checking, like saying ">=1.0.0".check("1.2.3") will be true
+ */
+export class Checker {
+    /**
+    * Will take in a range, like `>1.2` or `<1.2.3.4` or `=1.2` or `1.*`
+    * and return a checker, that has the check function for checking that a version is in the valid
+     * @param range 
+     * @returns 
+     */
+    static parse(range: string | Checker): Checker {
+        if (range instanceof Checker) {
+            return range
+        }
+        range = range.trim();
+        if (range.indexOf('||') !== -1) {
+            return rangeOr(...range.split('||').map(x => Checker.parse(x)));
+        }
+        if (range.indexOf('&&') !== -1) {
+            return rangeAnd(...range.split('&&').map(x => Checker.parse(x)));
+        }
+        if (range === '*') return new Checker((version) => {
+            EmVar.from(version)
+            return true
+        });
+        if (range.startsWith('!')) {
+            return Checker.parse(range.substring(1)).not()
+        }
+        const starSubMatches = starSub.exec(range)
+        if (starSubMatches != null) {
+            const emVarLower = EmVar.parse(starSubMatches[1])
+            const emVarUpper = emVarLower.withLastIncremented()
+
+            return new Checker((version) => {
+                const v = EmVar.from(version);
+                return (v.greaterThan(emVarLower) || v.equals(emVarLower)) && !v.greaterThan(emVarUpper) && !v.equals(emVarUpper);
+            })
+        }
+
+        switch (range.substring(0, 2)) {
+            case '>=': {
+                const emVar = EmVar.parse(range.substring(2));
+                return new Checker((version) => {
+                    const v = EmVar.from(version);
+                    return v.greaterThanOrEqual(emVar)
+                })
+            }
+            case '<=': {
+                const emVar = EmVar.parse(range.substring(2));
+                return new Checker((version) => {
+                    const v = EmVar.from(version);
+                    return v.lessThanOrEqual(emVar);
+                })
+            }
+
+        }
+
+        switch (range.substring(0, 1)) {
+            case '>': {
+                console.log('greaterThan')
+                const emVar = EmVar.parse(range.substring(1));
+                return new Checker((version) => {
+                    const v = EmVar.from(version);
+                    return v.greaterThan(emVar);
+                })
+            }
+            case '<': {
+                const emVar = EmVar.parse(range.substring(1));
+                return new Checker((version) => {
+                    const v = EmVar.from(version);
+                    return v.lessThan(emVar)
+                })
+            }
+            case '=': {
+                const emVar = EmVar.parse(range.substring(1));
+                return new Checker((version) => {
+                    const v = EmVar.from(version);
+                    return v.equals(emVar);
+                })
+            }
+
+        }
+        throw new Error("Couldn't parse range: " + range);
+    }
+    constructor(
+        /**
+         * Check is the function that will be given a emvar or unparsed emvar and should give if it follows
+         * a pattern
+         */
+        public readonly check: (value: string | EmVar) => boolean
+    ) { }
+
+
+    public and(...others: (Checker | string)[]): Checker {
+        return new Checker((value) => {
+            if (!this.check(value)) {
+                return false;
+            }
+            for (const other of others) {
+                if (!Checker.parse(other).check(value)) {
+                    return false
+                }
+            }
+            return true
+        });
+    }
+    public or(...others: (Checker | string)[]): Checker {
+        return new Checker((value) => {
+            if (this.check(value)) {
+                return true;
+            }
+            for (const other of others) {
+                if (Checker.parse(other).check(value)) {
+                    return true
+                }
+            }
+            return false
+        });
+    }
+    public not(): Checker {
+        return new Checker((value) => !this.check(value));
+    }
+}
\ No newline at end of file
diff --git a/emvar-lite/test.ts b/emvar-lite/test.ts
new file mode 100644
index 0000000..93ac26b
--- /dev/null
+++ b/emvar-lite/test.ts
@@ -0,0 +1,240 @@
+
+import { expect } from "https://deno.land/x/expect@v0.2.9/mod.ts";
+import { notRange, rangeAnd, rangeOf, rangeOr } from "./mod.ts";
+const { test } = Deno;
+
+
+{
+    const checker = rangeOf("*");
+    test("rangeOf('*')", () => {
+        expect(checker.check("1")).toBe(true);
+        expect(checker.check("1.2")).toBe(true);
+        expect(checker.check("1.2.3.4")).toBe(true);
+    })
+    test("rangeOf('*') invalid", () => {
+        expect(() => checker.check("a")).toThrow();
+        expect(() => checker.check("")).toThrow();
+        expect(() => checker.check("1..3")).toThrow();
+    })
+}
+
+{
+    const checker = rangeOf(">1.2.3.4");
+    test(`rangeOf(">1.2.3.4") valid`, () => {
+        expect(checker.check("2")).toBe(true);
+        expect(checker.check("1.2.3.5")).toBe(true);
+        expect(checker.check("1.2.3.4.1")).toBe(true);
+    })
+
+    test(`rangeOf(">1.2.3.4") invalid`, () => {
+        expect(checker.check("1.2.3.4")).toBe(false);
+        expect(checker.check("1.2.3")).toBe(false);
+        expect(checker.check("1")).toBe(false);
+    })
+}
+{
+    const checker = rangeOf("=1.2.3");
+    test(`rangeOf("=1.2.3") valid`, () => {
+        expect(checker.check("1.2.3")).toBe(true);
+    })
+
+    test(`rangeOf("=1.2.3") invalid`, () => {
+        expect(checker.check("2")).toBe(false);
+        expect(checker.check("1.2.3.1")).toBe(false);
+        expect(checker.check("1.2")).toBe(false);
+    })
+}
+{
+    const checker = rangeOf(">=1.2.3.4");
+    test(`rangeOf(">=1.2.3.4") valid`, () => {
+        expect(checker.check("2")).toBe(true);
+        expect(checker.check("1.2.3.5")).toBe(true);
+        expect(checker.check("1.2.3.4.1")).toBe(true);
+        expect(checker.check("1.2.3.4")).toBe(true);
+    })
+
+    test(`rangeOf(">=1.2.3.4") invalid`, () => {
+        expect(checker.check("1.2.3")).toBe(false);
+        expect(checker.check("1")).toBe(false);
+    })
+}
+{
+    const checker = rangeOf("<1.2.3.4");
+    test(`rangeOf("<1.2.3.4") invalid`, () => {
+        expect(checker.check("2")).toBe(false);
+        expect(checker.check("1.2.3.5")).toBe(false);
+        expect(checker.check("1.2.3.4.1")).toBe(false);
+        expect(checker.check("1.2.3.4")).toBe(false);
+    })
+
+    test(`rangeOf("<1.2.3.4") valid`, () => {
+        expect(checker.check("1.2.3")).toBe(true);
+        expect(checker.check("1")).toBe(true);
+    })
+}
+{
+    const checker = rangeOf("<=1.2.3.4");
+    test(`rangeOf("<=1.2.3.4") invalid`, () => {
+        expect(checker.check("2")).toBe(false);
+        expect(checker.check("1.2.3.5")).toBe(false);
+        expect(checker.check("1.2.3.4.1")).toBe(false);
+    })
+
+    test(`rangeOf("<=1.2.3.4") valid`, () => {
+        expect(checker.check("1.2.3")).toBe(true);
+        expect(checker.check("1")).toBe(true);
+        expect(checker.check("1.2.3.4")).toBe(true);
+    })
+}
+
+{
+
+    const checkA = rangeOf(">1");
+    const checkB = rangeOf("<=2");
+
+    const checker = rangeAnd(checkA, checkB);
+    test(`simple and(checkers) valid`, () => {
+        expect(checker.check("2")).toBe(true);
+
+        expect(checker.check("1.1")).toBe(true);
+    })
+    test(`simple and(checkers) invalid`, () => {
+        expect(checker.check("2.1")).toBe(false);
+        expect(checker.check("1")).toBe(false);
+        expect(checker.check("0")).toBe(false);
+    })
+}
+{
+
+    const checkA = rangeOf("<1");
+    const checkB = rangeOf("=2");
+
+    const checker = rangeOr(checkA, checkB);
+    test(`simple or(checkers) valid`, () => {
+        expect(checker.check("2")).toBe(true);
+        expect(checker.check("0.1")).toBe(true);
+    })
+    test(`simple or(checkers) invalid`, () => {
+        expect(checker.check("2.1")).toBe(false);
+        expect(checker.check("1")).toBe(false);
+        expect(checker.check("1.1")).toBe(false);
+    })
+}
+{
+    const checker = rangeOf('1.2.*');
+    test(`rangeOf(1.2.*) valid`, () => {
+        expect(checker.check("1.2")).toBe(true);
+        expect(checker.check("1.2.1")).toBe(true);
+    })
+    test(`rangeOf(1.2.*) invalid`, () => {
+        expect(checker.check("1.3")).toBe(false);
+        expect(checker.check("1.3.1")).toBe(false);
+
+        expect(checker.check("1.1.1")).toBe(false);
+        expect(checker.check("1.1")).toBe(false);
+        expect(checker.check("1")).toBe(false);
+
+
+        expect(checker.check("2")).toBe(false);
+    })
+}
+
+
+{
+    const checker = notRange(rangeOf('1.2.*'));
+    test(`notRange(rangeOf(1.2.*)) valid`, () => {
+        expect(checker.check("1.3")).toBe(true);
+        expect(checker.check("1.3.1")).toBe(true);
+
+        expect(checker.check("1.1.1")).toBe(true);
+        expect(checker.check("1.1")).toBe(true);
+        expect(checker.check("1")).toBe(true);
+
+
+        expect(checker.check("2")).toBe(true);
+    })
+    test(`notRange(rangeOf(1.2.*)) invalid `, () => {
+        expect(checker.check("1.2")).toBe(false);
+        expect(checker.check("1.2.1")).toBe(false);
+    })
+}
+
+{
+    const checker = rangeOf('!1.2.*');
+    test(`!(rangeOf(1.2.*)) valid`, () => {
+        expect(checker.check("1.3")).toBe(true);
+        expect(checker.check("1.3.1")).toBe(true);
+
+        expect(checker.check("1.1.1")).toBe(true);
+        expect(checker.check("1.1")).toBe(true);
+        expect(checker.check("1")).toBe(true);
+
+
+        expect(checker.check("2")).toBe(true);
+    })
+    test(`!(rangeOf(1.2.*)) invalid `, () => {
+        expect(checker.check("1.2")).toBe(false);
+        expect(checker.check("1.2.1")).toBe(false);
+    })
+}
+
+{
+    test(`no and ranges`, () => {
+        expect(() => rangeAnd()).toThrow()
+    })
+    test(`no or ranges`, () => {
+        expect(() => rangeOr()).toThrow()
+    })
+}
+{
+    const checker = rangeOf("!>1.2.3.4");
+    test(`rangeOf("!>1.2.3.4") invalid`, () => {
+        expect(checker.check("2")).toBe(false);
+        expect(checker.check("1.2.3.5")).toBe(false);
+        expect(checker.check("1.2.3.4.1")).toBe(false);
+    })
+
+    test(`rangeOf("!>1.2.3.4") valid`, () => {
+        expect(checker.check("1.2.3.4")).toBe(true);
+        expect(checker.check("1.2.3")).toBe(true);
+        expect(checker.check("1")).toBe(true);
+    })
+}
+
+test(">1 && =1.2", () => {
+    const checker = rangeOf(">1 && =1.2");
+
+    expect(checker.check("1.2")).toBe(true);
+    expect(checker.check("1.2.1")).toBe(false);
+
+})
+test("=1 || =2", () => {
+    const checker = rangeOf("=1 || =2");
+
+    expect(checker.check("1")).toBe(true);
+    expect(checker.check("2")).toBe(true);
+    expect(checker.check("3")).toBe(false);
+
+})
+
+
+test(">1 && =1.2 || =2", () => {
+    const checker = rangeOf(">1 && =1.2 || =2");
+
+    expect(checker.check("1.2")).toBe(true);
+    expect(checker.check("1")).toBe(false);
+    expect(checker.check("2")).toBe(true);
+    expect(checker.check("3")).toBe(false);
+
+})
+
+test("&& before || order of operationns:  <1.5 && >1 || >1.5 && <3", () => {
+    const checker = rangeOf("<1.5 && >1 || >1.5 && <3");
+    expect(checker.check("1.1")).toBe(true);
+    expect(checker.check("2")).toBe(true);
+
+    expect(checker.check("1.5")).toBe(false);
+    expect(checker.check("1")).toBe(false);
+    expect(checker.check("3")).toBe(false);
+
+})
\ No newline at end of file