diff --git a/data/DataType/boolean_flow.yaml b/data/DataType/boolean_flow.yaml
new file mode 100644
index 0000000..cb6b11f
--- /dev/null
+++ b/data/DataType/boolean_flow.yaml
@@ -0,0 +1,7 @@
+keyword: boolean
+integer-min: '0'
+integer-max: '1'
+integer-signed: false
+literals:
+  - 'true'
+  - 'false'
diff --git a/data/DataType/null_flow.yaml b/data/DataType/null_flow.yaml
new file mode 100644
index 0000000..534b32f
--- /dev/null
+++ b/data/DataType/null_flow.yaml
@@ -0,0 +1,3 @@
+keyword: null
+integer-min: '0'
+integer-max: '0'
diff --git a/data/DataType/number_flow.yaml b/data/DataType/number_flow.yaml
new file mode 100644
index 0000000..1efd589
--- /dev/null
+++ b/data/DataType/number_flow.yaml
@@ -0,0 +1,4 @@
+keyword: number
+integer-min: 'uncertain'
+integer-max: 'uncertain'
+integer-signed: true
diff --git a/data/DataType/string_flow.yaml b/data/DataType/string_flow.yaml
new file mode 100644
index 0000000..4bdf086
--- /dev/null
+++ b/data/DataType/string_flow.yaml
@@ -0,0 +1,4 @@
+keyword: string
+delimiters:
+  - single_quote
+  - double_quote
diff --git a/data/DataType/void_flow.yaml b/data/DataType/void_flow.yaml
new file mode 100644
index 0000000..32a1618
--- /dev/null
+++ b/data/DataType/void_flow.yaml
@@ -0,0 +1,4 @@
+keyword: void
+integer-min: '0'
+integer-max: '0'
+integer-signed: false
diff --git a/data/Delimiter/curly_braces_pipe.yaml b/data/Delimiter/curly_braces_pipe.yaml
new file mode 100644
index 0000000..64545dd
--- /dev/null
+++ b/data/Delimiter/curly_braces_pipe.yaml
@@ -0,0 +1,3 @@
+type: block
+start: '{|'
+end: '|}'
diff --git a/data/LangDerived/js_flow.yaml b/data/LangDerived/js_flow.yaml
new file mode 100644
index 0000000..715f688
--- /dev/null
+++ b/data/LangDerived/js_flow.yaml
@@ -0,0 +1 @@
+name: JavaScript
diff --git a/data/Language/Flow.yaml b/data/Language/Flow.yaml
new file mode 100644
index 0000000..78e64a2
--- /dev/null
+++ b/data/Language/Flow.yaml
@@ -0,0 +1,50 @@
+identifier: Flow
+full_name: Flow
+wikidata: Q59413589
+creation_date: 2014
+extensions:
+  - js.flow
+language_derivative: JavaScript
+line_continuation:
+  - backslash
+delimiters:
+  - double_slash
+  - multiline_slash_star
+  - single_quote_slash_escape
+  - double_quote_slash_escape
+  - curly_braces
+  - round_braces
+  - square_braces
+  - backticks
+  - curly_braces_pipe
+keywords:
+  - declare
+  - string
+  - boolean
+  - string
+  - number
+  - typeof
+  - return
+  - if
+  - let
+  - var
+  - function
+  - const
+  - object
+  - serialize
+  - interface
+  - implements
+  - array
+  - class
+  - new
+  - this
+  - constructor
+  - opaque
+  - type
+  - import
+datatypes:
+  - boolean_flow
+  - number_flow
+  - string_flow
+  - void_flow
+  - null_flow
diff --git a/models/LangDerived.yaml b/models/LangDerived.yaml
new file mode 100644
index 0000000..a0157b7
--- /dev/null
+++ b/models/LangDerived.yaml
@@ -0,0 +1 @@
+name: String
diff --git a/models/Language.yaml b/models/Language.yaml
index 9146336..90a604e 100644
--- a/models/Language.yaml
+++ b/models/Language.yaml
@@ -13,6 +13,7 @@ versions: String
 grammar_file: String
 aliases: Alias[]
 extensions: FileExtension[]
+language_derivative: LangDerived[]
 line_continuation: LineCont[]
 delimiters: Delimiter[]
 datatypes: DataType[]