diff --git a/packages/nashorn/.gitignore b/packages/nashorn/.gitignore
index d856d44c..cdc3d90d 100644
--- a/packages/nashorn/.gitignore
+++ b/packages/nashorn/.gitignore
@@ -2,3 +2,4 @@
 /dist
 /package-lock.json
 /yarn.lock
+/docs
diff --git a/packages/nashorn/build.sh b/packages/nashorn/build.sh
new file mode 100755
index 00000000..577f2831
--- /dev/null
+++ b/packages/nashorn/build.sh
@@ -0,0 +1,9 @@
+npx tsc src/build.ts --outDir dist
+cd dist
+rm -rf temp
+mkdir -p temp
+node build.js
+cd ../
+rm -rf src/typings
+mkdir -p src/typings/bukkit
+cp dist/temp/* src/typings/bukkit/ -R
diff --git a/packages/nashorn/package.json b/packages/nashorn/package.json
index 67adf58c..1a79b2e3 100644
--- a/packages/nashorn/package.json
+++ b/packages/nashorn/package.json
@@ -27,4 +27,4 @@
         "rimraf": "^3.0.0",
         "typescript": "^3.6.2"
     }
-}
\ No newline at end of file
+}
diff --git a/packages/nashorn/src/build.ts b/packages/nashorn/src/build.ts
new file mode 100644
index 00000000..fc2bf36a
--- /dev/null
+++ b/packages/nashorn/src/build.ts
@@ -0,0 +1,131 @@
+import * as fs from "fs";
+
+let whiteKey = ['shift', "map", 'filter', 'values', 'valueOf', 'toString', 'length', 'includes']
+
+function convertJson2TypeDefiend(infile: string, outDir: string) {
+    const file = infile.split(".json")[0];
+    const json = fs.readFileSync(`../docs/${file}.json`).toString();
+    const obj = JSON.parse(json);
+    const qnas: string[] = obj.qualifiedName.split(".");
+    let closeBuk = 0;
+    let temp = `declare namespace ${qnas[0]} {\n`;
+    closeBuk++;
+    const nms = qnas.slice(1, qnas.length - 1);
+    for (const nm of nms) {
+        temp += `${'    '.repeat(closeBuk)}namespace ${nm} {\n`;
+        closeBuk++;
+    }
+    let classModifier = formatClassModifier(obj.modifiers)
+    temp += `${'    '.repeat(closeBuk)}${classModifier}class ${qnas[qnas.length - 1]} {\n`;
+    closeBuk++;
+    for (const constructor of obj.constructors) {
+        temp += `${formatDoc(constructor.docString, closeBuk)}${'    '.repeat(closeBuk)}constructor(${formatParameters(constructor.parameters)})\n`;
+    }
+
+    let members = [];
+
+    let methods = '';
+    for (const method of obj.methods) {
+        let methodModifier = replaceModifiers(method.modifiers, classModifier.includes('abstract'))
+        if (!whiteKey.includes(method.name)) {
+            if (members[method.name] && methodModifier.includes('abstract')) {
+                continue;
+            }
+            members[method.name] = methodModifier;
+        }
+        methods += `${formatDoc(method.docString, closeBuk)}${'    '.repeat(closeBuk)}${methodModifier} ${method.name}(${formatParameters(method.parameters)}): ${mappingType(method.returnType.type)};\n`;
+    }
+
+    let fields = '';
+    for (const field of obj.fields) {
+        if (members[field.name]) {
+            continue;
+        }
+        fields += `${'    '.repeat(closeBuk)}${replaceModifiers(field.modifiers)} ${field.name}: ${mappingType(field.type ? field.type.type : "any")};\n`;
+    }
+
+    temp += fields + methods;
+
+    for (let index = 0; index < closeBuk; index++) {
+        temp += `${'    '.repeat(closeBuk - index - 1)}}\n`;
+    }
+
+    fs.writeFileSync(`${outDir}/${file}.ts`, temp);
+    return `${file}.ts`;
+}
+
+function formatClassModifier(modifiers: string) {
+    let tempm = modifiers.replace('public', '').replace('interface', '').replace('static', '').replace('final', '').trim();
+    return tempm.length > 0 ? (tempm + ' ') : '';
+}
+
+function formatDoc(doc: string, closeBuk: number) {
+    let middleDoc = '';
+    for (const line of doc.split('\n')) {
+        if (line.trim().length != 0) {
+            middleDoc += `${'    '.repeat(closeBuk)} * ${line.trim()}\n`
+        }
+    }
+    return middleDoc.length > 0 ? `${'    '.repeat(closeBuk)}/**\n${middleDoc}${'    '.repeat(closeBuk)} */\n` : '';
+}
+
+function replaceModifiers(modifiers: string, absClass = false): string {
+    modifiers = modifiers.split(" final")[0];
+    modifiers = modifiers.split(" synchronized")[0];
+    if (!absClass) {
+        modifiers = modifiers.split(" abstract")[0];
+    }
+    return modifiers;
+}
+
+function formatParameters(params: any[]) {
+    let tempParam = '';
+    for (const p of params) {
+        tempParam += `${mappingName(p.name)}: ${mappingType(p.type ? p.type.qualifiedName : 'any')}, `
+    }
+    return tempParam.substr(0, tempParam.length - 2);
+}
+
+const nameMap = [];
+nameMap['function'] = 'func'
+nameMap['in'] = 'input'
+
+function mappingName(name: string) {
+    if (whiteKey.includes(name)) { return name }
+    let outName = nameMap[name] || name || '';
+    return outName;
+}
+
+const typeMap = [];
+typeMap['int'] = 'number';
+typeMap['int[]'] = 'number[]';
+typeMap['int[][]'] = 'number[][]';
+typeMap['byte'] = 'number';
+typeMap['byte[]'] = 'number[]';
+typeMap['double'] = 'number';
+typeMap['short'] = 'number';
+typeMap['float'] = 'number';
+typeMap['long'] = 'number';
+typeMap['<any>'] = 'any';
+typeMap['char'] = 'string';
+typeMap['java.lang.String'] = "string";
+typeMap['java.util.Date'] = 'any /*java.util.Date*/'
+typeMap['java.util.List'] = 'any[] /*java.util.List*/'
+typeMap['java.util.Set'] = 'any[] /*java.util.Set*/'
+typeMap['java.util.Collection'] = 'any[] /*java.util.Collection*/'
+typeMap['java.util.Map'] = 'Map<any, any> /*java.util.Map*/'
+
+function mappingType(type: string): string {
+    let outType = typeMap[type] || type || 'any';
+    outType = outType.startsWith('java.') ? 'any' : outType;
+    return outType;
+}
+
+const outDir = "./temp";
+
+const files = fs.readdirSync("../docs");
+let index = ``;
+for (const file of files) {
+    index += `/// <reference path="./${convertJson2TypeDefiend(file, outDir)}" />\n`;
+}
+fs.writeFileSync(`${outDir}/index.ts`, index);
diff --git a/packages/nashorn/src/index.ts b/packages/nashorn/src/index.ts
index 4063fb68..9c660108 100644
--- a/packages/nashorn/src/index.ts
+++ b/packages/nashorn/src/index.ts
@@ -1,8 +1,42 @@
 declare global {
+    const __FILE__: string;
+    const __LINE__: number;
+    const __DIR__: string;
+    let Packages: any;
+
+    function print(...message: any[]): void;
+    function load(script: string | object);
+    function loadWithNewGlobal(script: string | object);
+    function exit(code?: number);
+    function quit(code?: number);
+    function JavaImporter(...className: string[]);
+
     namespace Java {
         function type(clazz: string): any;
         function from(javaObj: any): any[];
         function to(array: any[]): any;
+        function extend(...parentTypes: any[]);
+        //@ts-ignore
+        // function super(type: any);
+    }
+
+    interface Error {
+        readonly lineNumber?: number;
+        readonly columnNumber?: number;
+        readonly fileName?: string;
+        dumpStack?: Function;
+        printStackTrace?: Function;
+        getStackTrace?: () => any[];
+    }
+
+    interface String {
+        trimLeft();
+        trimRight();
+    }
+
+    interface Object {
+        setPrototypeOf(obj: object, prototype: object);
+        bindProperties(to: object, from: object);
     }
 }