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start-java.ts

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+import fs from "node:fs";
+import child_process from "node:child_process";
+
+type Properties = {
+    "jar-file": string,
+    "terminal"?: boolean,
+    "minimum-mem"?: string,
+    "maximum-mem"?: string
+}
+
+let jvm_properties: Properties = JSON.parse(fs.readFileSync("jvm-properties.json", { encoding: "utf8" }));
+
+if (jvm_properties["jar-file"] === undefined) throw new Error("`jar-file` is a required option.");
+
+if (jvm_properties["terminal"] === undefined) jvm_properties["terminal"] = false;
+if (jvm_properties["minimum-mem"] === undefined) jvm_properties["minimum-mem"] = "1G";
+if (jvm_properties["maximum-mem"] === undefined) jvm_properties["maximum-mem"] = "4G";
+
+let subprocess = child_process.spawn(jvm_properties["terminal"] ? "java" : "javaw",
+    [`-Xms${ jvm_properties["minimum-mem"] }`,
+     `-Xmx${ jvm_properties["maximum-mem"] }`,
+     "-jar", jvm_properties["jar-file"]],
+    { stdio: "ignore", detached: true, windowsHide: !jvm_properties["terminal"] }
+);
+
+subprocess.unref();

tsconfig.json

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+{
+    "compilerOptions":
+    {
+        "module": "es6"
+    }
+}