diff --git a/.gitignore b/.gitignore
index 7d13ee199..16a75280b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 yarn-error.log
 package-lock.json
 node_modules/
+.env
 
 # Local Netlify folder
 .netlify
\ No newline at end of file
diff --git a/mon-entreprise/source/components/ui/animate.tsx b/mon-entreprise/source/components/ui/animate.tsx
index 9ed810d87..50024c591 100644
--- a/mon-entreprise/source/components/ui/animate.tsx
+++ b/mon-entreprise/source/components/ui/animate.tsx
@@ -99,7 +99,7 @@ export const leftToRight = ({
 		delay={delay}
 		leave={{
 			opacity: 0,
-			position: 'absolute',
+			position: 'absolute' as const,
 			transform: 'translateX(-100%)'
 		}}
 		items={children}
diff --git a/mon-entreprise/source/components/utils/useNextQuestion.tsx b/mon-entreprise/source/components/utils/useNextQuestion.tsx
index 45c717403..625853fe8 100644
--- a/mon-entreprise/source/components/utils/useNextQuestion.tsx
+++ b/mon-entreprise/source/components/utils/useNextQuestion.tsx
@@ -36,14 +36,18 @@ import { useMemo } from 'react'
 import { DottedName } from 'Rules'
 import { Simulation, SimulationConfig } from 'Reducers/rootReducer'
 
-type MissingVariables = Array<Partial<Record<DottedName, number>>>
+type MissingVariables = Partial<Record<DottedName, number>>
 export function getNextSteps(
-	missingVariables: MissingVariables
+	missingVariables: Array<MissingVariables>
 ): Array<DottedName> {
 	const byCount = ([, [count]]) => count
 	const byScore = ([, [, score]]) => score
 
-	const missingByTotalScore = reduce(mergeWith(add), {}, missingVariables)
+	const missingByTotalScore = reduce<MissingVariables, MissingVariables>(
+		mergeWith(add),
+		{},
+		missingVariables
+	)
 
 	const innerKeys = flatten(map(keys, missingVariables)),
 		missingByTargetsAdvanced = countBy(identity, innerKeys)
@@ -53,9 +57,9 @@ export function getNextSteps(
 			missingByTargetsAdvanced,
 			missingByTotalScore
 		),
-		pairs = toPairs(missingByCompound),
+		pairs = toPairs<number>(missingByCompound),
 		sortedPairs = sortWith([descend(byCount), descend(byScore) as any], pairs)
-	return map(head, sortedPairs)
+	return map(head, sortedPairs) as any
 }
 
 const similarity = (rule1 = '', rule2 = '') =>
@@ -67,7 +71,7 @@ const similarity = (rule1 = '', rule2 = '') =>
 	)(rule1.split(' . '), rule2.split(' . '))
 
 export function getNextQuestions(
-	missingVariables: MissingVariables,
+	missingVariables: Array<MissingVariables>,
 	questionConfig: SimulationConfig['questions'] = {},
 	answeredQuestions: Array<DottedName> = [],
 	situation: Simulation['situation'] = {}
diff --git a/mon-entreprise/source/sites/mon-entreprise.fr/pages/integration/Iframe.tsx b/mon-entreprise/source/sites/mon-entreprise.fr/pages/integration/Iframe.tsx
index a07e118e7..15238a279 100644
--- a/mon-entreprise/source/sites/mon-entreprise.fr/pages/integration/Iframe.tsx
+++ b/mon-entreprise/source/sites/mon-entreprise.fr/pages/integration/Iframe.tsx
@@ -296,11 +296,11 @@ function IntegrationCode({
 			)}
 			<br />
 			<em>src</em>
-			="https://mon-entreprise.fr/simulateur-iframe-integration.js">
+			="https://mon-entreprise.fr/simulateur-iframe-integration.js"{'>'}
 			<span>{'<'}</span>
 			<span>/</span>
 			<em>script</em>
-			<span>></span>
+			<span>{'>'}</span>
 		</code>
 	)
 }
diff --git a/package.json b/package.json
index fa8767c58..c0ec35dc0 100644
--- a/package.json
+++ b/package.json
@@ -95,7 +95,7 @@
 		"source-map-support": "^0.5.4",
 		"style-loader": "^0.23.1",
 		"toml-loader": "^1.0.0",
-		"typescript": "^3.8.3",
+		"typescript": "^3.9.2",
 		"url-loader": "^1.0.1",
 		"webpack": "^4.39.3",
 		"webpack-bundle-analyzer": "^3.7.0",
@@ -121,7 +121,7 @@
 		"lint": "yarn lint:eslintrc && yarn lint:eslint && yarn lint:prettier",
 		"test": "yarn workspaces run test",
 		"prepare": "yarn workspace mon-entreprise run prepare",
-		"test:type": "yarn workspaces run tsc --noEmit",
+		"test:type": "yarn workspaces run tsc",
 		"test:regressions": "jest",
 		"link:publicodes": "yarn workspace publicodes link && yarn workspace mon-entreprise link publicodes"
 	},
diff --git a/tsconfig.json b/tsconfig.json
index 2539afd81..7b58e7456 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,6 +8,7 @@
 		"forceConsistentCasingInFileNames": true,
 		"resolveJsonModule": true,
 		"allowJs": true,
+		"noEmit": true,
 		// The end goal is to enable `"strict": true` which correspond to the
 		// following settings: noImplicitAny, noImplicitThis, alwaysStrict,
 		// strictBindCallApply, strictNullChecks, strictFunctionTypes, and
diff --git a/yarn.lock b/yarn.lock
index 90d1ada64..bd53894b1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5944,7 +5944,7 @@ https-proxy-agent@^4.0.0:
     vue-template-compiler "^2.6.11"
     yamljs "^0.3.0"
 
-i18next@^19.0.1, i18next@^19.4.4:
+i18next@^19.0.1:
   version "19.4.4"
   resolved "https://registry.yarnpkg.com/i18next/-/i18next-19.4.4.tgz#c0a18bc2f2be554da636e67bfbf5200c7948b60d"
   integrity sha512-ofaHtdsDdX3A5nYur1HWblB7J4hIcjr2ACdnwTAJgc8hTfPbyzZfGX0hVkKpI3vzDIgO6Uzc4v1ffW2W6gG6zw==
@@ -9236,7 +9236,6 @@ public-encrypt@^4.0.0:
   version "1.0.0"
   dependencies:
     classnames "^2.2.6"
-    i18next "^19.4.4"
     moo "^0.5.1"
     nearley "^2.19.2"
     ramda "^0.27.0"
@@ -11465,11 +11464,16 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^3.6.4, typescript@^3.8.3:
+typescript@^3.6.4:
   version "3.8.3"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.8.3.tgz#409eb8544ea0335711205869ec458ab109ee1061"
   integrity sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
 
+typescript@^3.9.2:
+  version "3.9.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.2.tgz#64e9c8e9be6ea583c54607677dd4680a1cf35db9"
+  integrity sha512-q2ktq4n/uLuNNShyayit+DTobV2ApPEo/6so68JaD5ojvc/6GClBipedB9zNWYxRSAlZXAe405Rlijzl6qDiSw==
+
 uglify-js@3.4.x:
   version "3.4.10"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.4.10.tgz#9ad9563d8eb3acdfb8d38597d2af1d815f6a755f"