diff --git a/crates/erg_compiler/lib/external/matplotlib.d/__init__.d.er b/crates/erg_compiler/lib/external/matplotlib.d/__init__.d.er
new file mode 100644
index 00000000..a15813ca
--- /dev/null
+++ b/crates/erg_compiler/lib/external/matplotlib.d/__init__.d.er
@@ -0,0 +1 @@
+.pyplot = pyimport "./pyplot"
diff --git a/crates/erg_compiler/lib/external/matplotlib.d/legend.d/__init__.d.er b/crates/erg_compiler/lib/external/matplotlib.d/legend.d/__init__.d.er
new file mode 100644
index 00000000..f79972cd
--- /dev/null
+++ b/crates/erg_compiler/lib/external/matplotlib.d/legend.d/__init__.d.er
@@ -0,0 +1 @@
+.Legend: ClassType
diff --git a/crates/erg_compiler/lib/external/matplotlib.d/lines.d/__init__.d.er b/crates/erg_compiler/lib/external/matplotlib.d/lines.d/__init__.d.er
new file mode 100644
index 00000000..85960617
--- /dev/null
+++ b/crates/erg_compiler/lib/external/matplotlib.d/lines.d/__init__.d.er
@@ -0,0 +1,2 @@
+.Line2D: ClassType
+.Line3D: ClassType
diff --git a/crates/erg_compiler/lib/external/matplotlib.d/pyplot.d/__init__.d.er b/crates/erg_compiler/lib/external/matplotlib.d/pyplot.d/__init__.d.er
new file mode 100644
index 00000000..21392762
--- /dev/null
+++ b/crates/erg_compiler/lib/external/matplotlib.d/pyplot.d/__init__.d.er
@@ -0,0 +1,10 @@
+lines = pyimport "../lines"
+text = pyimport "../text"
+legend = pyimport "../legend"
+
+.plot!: (*args: Obj, scaleX := Bool, scaleY := Bool) => [Obj; _]
+.show!: () => NoneType
+.title!: (title: Str) => text.Text
+.xlabel!: (label: Str) => text.Text
+.ylabel!: (label: Str) => text.Text
+.legend!: (labels := [Str; _]) => legend.Legend
diff --git a/crates/erg_compiler/lib/external/matplotlib.d/text.d/__init__.d.er b/crates/erg_compiler/lib/external/matplotlib.d/text.d/__init__.d.er
new file mode 100644
index 00000000..50ea975f
--- /dev/null
+++ b/crates/erg_compiler/lib/external/matplotlib.d/text.d/__init__.d.er
@@ -0,0 +1 @@
+.Text: ClassType
diff --git a/crates/erg_compiler/lib/external/setuptools.d/__init__.d.er b/crates/erg_compiler/lib/external/setuptools.d/__init__.d.er
new file mode 100644
index 00000000..c9611432
--- /dev/null
+++ b/crates/erg_compiler/lib/external/setuptools.d/__init__.d.er
@@ -0,0 +1 @@
+.setup!: (*Obj,) => NoneType
diff --git a/crates/erg_compiler/lib/external/setuptools.d/command.d/develop.d.er b/crates/erg_compiler/lib/external/setuptools.d/command.d/develop.d.er
new file mode 100644
index 00000000..05902313
--- /dev/null
+++ b/crates/erg_compiler/lib/external/setuptools.d/command.d/develop.d.er
@@ -0,0 +1,3 @@
+.Develop = 'develop': ClassType
+.Develop.
+    run!: (self: .Develop) => NoneType
diff --git a/crates/erg_compiler/lib/external/setuptools.d/command.d/install.d.er b/crates/erg_compiler/lib/external/setuptools.d/command.d/install.d.er
new file mode 100644
index 00000000..d8294f5b
--- /dev/null
+++ b/crates/erg_compiler/lib/external/setuptools.d/command.d/install.d.er
@@ -0,0 +1,3 @@
+.Install = 'install': ClassType
+.Install.
+    run!: (self: .Install) => NoneType