diff --git a/settings.gradle.kts b/settings.gradle.kts
index aaf891a63..27b9b3fc2 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -20,6 +20,7 @@ fun includeProject(projectPath: String, path: String? = null) {
 includeProject(":mirai-console", "backend/mirai-console")
 includeProject(":mirai-console.codegen", "backend/codegen")
 includeProject(":mirai-console-pure", "frontend/mirai-console-pure")
+includeProject(":mirai-console-compiler-common", "tools/compiler-common")
 includeProject(":mirai-console-intellij", "tools/intellij-plugin")
 includeProject(":mirai-console-gradle", "tools/gradle-plugin")
 
diff --git a/tools/compiler-common/README.md b/tools/compiler-common/README.md
new file mode 100644
index 000000000..a3e4973fb
--- /dev/null
+++ b/tools/compiler-common/README.md
@@ -0,0 +1,5 @@
+# mirai-console-compiler-common
+
+Mirai Console 编译器后端通用模块.
+
+##
\ No newline at end of file
diff --git a/tools/compiler-common/build.gradle.kts b/tools/compiler-common/build.gradle.kts
new file mode 100644
index 000000000..fb6a5e172
--- /dev/null
+++ b/tools/compiler-common/build.gradle.kts
@@ -0,0 +1,75 @@
+@file:Suppress("UnusedImport")
+
+plugins {
+    kotlin("jvm")
+    id("java")
+    `maven-publish`
+    id("com.jfrog.bintray")
+}
+
+repositories {
+    maven("http://maven.aliyun.com/nexus/content/groups/public/")
+}
+
+version = Versions.console
+description = "Mirai Console compiler common"
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
+
+tasks.withType(JavaCompile::class.java) {
+    options.encoding = "UTF8"
+}
+
+kotlin {
+    sourceSets.all {
+        target.compilations.all {
+            kotlinOptions {
+                jvmTarget = "1.8"
+                freeCompilerArgs = freeCompilerArgs + "-Xjvm-default=all"
+                //useIR = true
+            }
+        }
+        languageSettings.apply {
+            progressiveMode = true
+
+            useExperimentalAnnotation("kotlin.Experimental")
+            useExperimentalAnnotation("kotlin.RequiresOptIn")
+
+            useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiInternalAPI")
+            useExperimentalAnnotation("net.mamoe.mirai.utils.MiraiExperimentalAPI")
+            useExperimentalAnnotation("net.mamoe.mirai.console.ConsoleFrontEndImplementation")
+            useExperimentalAnnotation("net.mamoe.mirai.console.util.ConsoleExperimentalApi")
+            useExperimentalAnnotation("kotlin.ExperimentalUnsignedTypes")
+            useExperimentalAnnotation("kotlin.experimental.ExperimentalTypeInference")
+            useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
+            useExperimentalAnnotation("kotlinx.serialization.ExperimentalSerializationApi")
+            useExperimentalAnnotation("net.mamoe.mirai.console.util.ConsoleInternalApi")
+        }
+    }
+}
+
+dependencies {
+    api("org.jetbrains:annotations:19.0.0")
+    api(kotlinx("coroutines-jdk8", Versions.coroutines))
+
+    compileOnly("org.jetbrains.kotlin:kotlin-compiler:${Versions.kotlinCompiler}")
+    compileOnly("org.jetbrains.kotlin:kotlin-compiler:${Versions.kotlinCompiler}")
+    compileOnly(files("libs/ide-common.jar"))
+
+    testApi(kotlin("test"))
+    testApi(kotlin("test-junit5"))
+
+    testImplementation("org.junit.jupiter:junit-jupiter-api:5.2.0")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.2.0")
+}
+
+tasks {
+    "test"(Test::class) {
+        useJUnitPlatform()
+    }
+}
+
+// setupPublishing("mirai-console-intellij")
\ No newline at end of file
diff --git a/tools/compiler-common/src/main/java/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrors.java b/tools/compiler-common/src/main/java/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrors.java
new file mode 100644
index 000000000..2b65a3bd8
--- /dev/null
+++ b/tools/compiler-common/src/main/java/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrors.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2019-2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AFFERO GENERAL PUBLIC LICENSE version 3 license that can be found via the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.compiler.common.diagnostics;
+
+import com.intellij.psi.PsiElement;
+import org.jetbrains.kotlin.diagnostics.DiagnosticFactory1;
+import org.jetbrains.kotlin.diagnostics.Errors;
+
+import static org.jetbrains.kotlin.diagnostics.Severity.ERROR;
+
+public interface MiraiConsoleErrors {
+    DiagnosticFactory1<PsiElement, String> ILLEGAL_PLUGIN_ID = DiagnosticFactory1.create(ERROR);
+    DiagnosticFactory1<PsiElement, String> ILLEGAL_PLUGIN_NAME = DiagnosticFactory1.create(ERROR);
+
+    @Deprecated
+    Object _init = new Object() {
+        {
+            Errors.Initializer.initializeFactoryNamesAndDefaultErrorMessages(
+                    MiraiConsoleErrors.class,
+                    MiraiConsoleErrorsRendering.INSTANCE
+            );
+        }
+    };
+}
diff --git a/tools/compiler-common/src/main/kotlin/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrorsRendering.kt b/tools/compiler-common/src/main/kotlin/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrorsRendering.kt
new file mode 100644
index 000000000..8eb25bc37
--- /dev/null
+++ b/tools/compiler-common/src/main/kotlin/net/mamoe/mirai/console/compiler/common/diagnostics/MiraiConsoleErrorsRendering.kt
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2019-2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AFFERO GENERAL PUBLIC LICENSE version 3 license that can be found via the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.compiler.common.diagnostics
+
+import net.mamoe.mirai.console.compiler.common.diagnostics.MiraiConsoleErrors.ILLEGAL_PLUGIN_ID
+import net.mamoe.mirai.console.compiler.common.diagnostics.MiraiConsoleErrors.ILLEGAL_PLUGIN_NAME
+import org.jetbrains.kotlin.diagnostics.rendering.DefaultErrorMessages
+import org.jetbrains.kotlin.diagnostics.rendering.DiagnosticFactoryToRendererMap
+import org.jetbrains.kotlin.diagnostics.rendering.Renderers
+
+object MiraiConsoleErrorsRendering : DefaultErrorMessages.Extension {
+    private val MAP = DiagnosticFactoryToRendererMap("MiraiConsole").apply {
+        put(
+            ILLEGAL_PLUGIN_ID,
+            "Illegal plugin id: '{0}'",
+            Renderers.STRING
+        )
+        put(
+            ILLEGAL_PLUGIN_NAME,
+            "Illegal plugin name: '{0}'",
+            Renderers.STRING
+        )
+    }
+
+    override fun getMap() = MAP
+}
diff --git a/tools/gradle-plugin/README.md b/tools/gradle-plugin/README.md
new file mode 100644
index 000000000..78e0e7f29
--- /dev/null
+++ b/tools/gradle-plugin/README.md
@@ -0,0 +1,2 @@
+# mirai-console-gradle
+
diff --git a/tools/intellij-plugin/README.md b/tools/intellij-plugin/README.md
new file mode 100644
index 000000000..da5b520e0
--- /dev/null
+++ b/tools/intellij-plugin/README.md
@@ -0,0 +1,7 @@
+# mirai-console-intellij
+
+IntelliJ 平台的 Mirai Console 开发插件
+
+## 功能
+
+### 诊断
\ No newline at end of file
diff --git a/tools/intellij-plugin/build.gradle.kts b/tools/intellij-plugin/build.gradle.kts
index ace7adb38..3520633be 100644
--- a/tools/intellij-plugin/build.gradle.kts
+++ b/tools/intellij-plugin/build.gradle.kts
@@ -87,6 +87,8 @@ dependencies {
     api("org.jetbrains:annotations:19.0.0")
     api(kotlinx("coroutines-jdk8", Versions.coroutines))
 
+    api(project(":mirai-console-compiler-common"))
+
     compileOnly("org.jetbrains.kotlin:kotlin-compiler:${Versions.kotlinCompiler}")
     compileOnly("org.jetbrains.kotlin:kotlin-compiler:${Versions.kotlinCompiler}")
     compileOnly(files("libs/ide-common.jar"))